2013 Hangzhou Workshop 2013 Hangzhou Workshop on Quantum Matteron Quantum Matter

PROGRAM

April 22-25, 2013

International Conference CenterMengminwei Building, Rm 138, Zhejiang University

Organized by

Department of Physics, Zhejiang UniversityDepartment of Physics and Astronomy, Rice University Department of Physics, Hangzhou Normal University

Sponsored by

Zhejiang University

Hangzhou Normal University

National Natural Science Foundation of China

Natural Science Foundation of Zhejiang Province

美国 Nufern 公司 和 上海瀚宇光纤通信技术有限公司

2013 Hangzhou Workshop on Quantum Matter Page 1 /65

Table of Contents

Introduction to the 2013 Hangzhou Workshop …..................................................................... 3

International Collaborative Center on Quantum Matter …....................................................... 5

Workshop Program …............................................................................................................... 6

Abstracts of invited talks ....................................................................................................... 11

Abstracts of posters ............................................................................................................... 36

List of participants …............................................................................................................... 45 Invited speakers, organizers and committee members …....................................................45 Participants with a poster presentation …............................................................................49 Other non-student participants …....................................................................................... 50 Student participants …........................................................................................................ 54 Secretaries …......... …........................................................................................................ 54

Travel information .................................................................................................................. 56

Blank pages ….........….......................................................................................................... 59

Local and campus maps …..................................................................................................... 63

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Introduction to the 2013 Hangzhou Workshop

The Hangzhou Workshop on Quantum Matter is organized annually by the International Collaborative Center for Quantum Matter (ICCQM), a virtual research center established in 2009 as a platform for collaboration in the areas of quantum matter between Rice University and Zhejiang University. Other participating institutions of the ICCQM include the Max Planck Institute for Chemical Physics of Solids in Dresden, the London Center for Nanotechnology, the University of Science and Technology of China, and Hangzhou Normal University. Information on previous workshops can be found at the website of the ICCQM: http://zimp.zju.edu.cn/~iccqm/ .

The primary purpose of the Hangzhou workshop is to explore the long term institutional collaborations between Zhejiang University, Rice University, and a number of other institutions from Asia, North America and Europe, in the area of quantum matter. This frontier subject concerns modern condensed matter and atomic systems, in which quantum correlation and quantum coherence strongly influence their physics properties.

The 2013 Workshop will cover topics in strongly correlated electrons and cold atoms. It will consist of 40 invited talks over 3 and a half days, allocated about equally to these two areas. The topics in cold atoms will focus on strongly interacting Fermi gases, polar molecules and magnetic atoms, synthetic gauge fields and spin-orbit coupling. The topics in strongly correlated electrons will cover a broad range with an emphasis on heavy fermions, quantum critical phenomena, magnetic frustration, and topological insulators/superfluids. A common theme of the Workshop is strong correlations.

The 2013 workshop will bring experimentalists and theorists together from countries including China, USA, Europe, and Japan. The workshop will address newly discovered quantum phases and novel quantum phenomena in strongly correlated systems and cold atoms. It also aims to stimulate and encourage more junior scientists and students to engage in research on quantum matter. The Workshop will be followed by a one-day tutorial program.

International Advisory Committee

Qimiao Si (Rice University, Chair)

Elihu Abrahams (UCLA) Gabriel Aeppli (University College London)

Jason Ho (Ohio State University) Kathy Levin (University of Chicago) Jianwei Pan (Univ Science & Technol. China) Frank Steglich (Max-Planck Inst.) John Thomas (Duke University/North Carolina State Univ.) Xin-Cheng Xie (Peking University) Lu Yu (Institute of Physics, Chinese Academy of Sciences)

2013 Hangzhou Workshop on Quantum Matter Page 4 /65

Fu-Chun Zhang (Hong Kong University)

Organizing Committee

Qijin Chen (Zhejiang University, Chair)

Jianhui Dai (Hangzhou Normal University, Co-Chair)

Chao Cao (Hangzhou Normal University) Zhuan Xu (Zhejiang University)

Huiqiu Yuan (Zhejiang University)

Yi Zhou (Zhejiang University)

Sponsors

Zhejiang University Hangzhou Normal University

Other Financial Supports

National Natural Science Foundation of ChinaNatural Science Foundation of Zhejiang Province美国Nufern 公司 和.上海瀚宇光纤通信技术有限公司

Venue

International Conference CenterMengminwei Bldg, Rm 138Zijingang Campus, Zhejiang University

Contacts: Qijin Chen qchen@zju.edu.cn Tel: 13868051460 Jianhui Dai daijh@hznu.zju.edu.cn Tel: 13819101236 Joyce Jun Chen tqc001@zju.edu.cn (secretary) Tel: 13456853344

Website

http://zimp.zju.edu.cn/~iccqm/workshop2013/ .

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Introduction to

International Collaborative Center on Quantum Matter

Background

Zhejiang University (ZJU) in China and Rice University (RU) in USA bear many similarities, both geographically and in terms of the emphasis each university places on science and technology. The complementary strengths with the strong relationship between the leadership at university level of both sides have presented an opportunity to create a virture research center that brings together faculty research clusters at both institutions and leverages the combined efforts to engage additional international faculty collaborations. Preliminary efforts for such collaboration have been made over the past several years, particularly in the area of Quantum Matter. This area is a frontier subject in physics and materials science, with major impacts on the science and technology of modern society.

ZJU-Rice Agreement

On July 3, 2008, the Memorandum of Understanding between Zhejiang University and Rice University was signed by former President Wei Yang and former President David W. Leebron in Hangzhou. According to the Memorandum, an International Collaboration Center on Quantum Matter (ICCQM) was established on the Zhejiang University campus in October 2009. The goal of the ICCQM is to enhance the long-term international research collaborations between Zhejiang University and Rice University, along with other leading international institutions in the broad area of quantum matter. The cooperation includes, but not limited to, collaboration in research, conducting joint workshops, and mutual research visits between faculty and students. Both universities agree to support efforts associated with the ICCQM and seek the participation of other institutions in order to create a critical mass in sustaining a network of substantive collaborations among the individual participating research groups. The ICCQM was officially established at the 2009 Hangzhou Workshop on Quantum Matter.

Participating Institutions

Max-Planck Institute of Chemical Physics in Solids London Center for NanotechnologyHangzhou Normal UniversityUniversity of Science and Technology of China

Organizations

The ICCQM consists of physicists from participating institutions, including co-directors Professors Fu-Chun Zhang and Qimiao Si, representing Zhejiang University and Rice University, respectively. It has three committees: the International Advisory Committee, the International Academic Committee, and the Executive Committee.

Website

The ICCQM has a website at http://zimp.zju.edu.cn/~iccqm/.

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The The ProgramProgram

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Scientific Program

4/21/2013

13:00 - 20:00 Registration (Location: Qizhen Hotel)

18:00 - 20:00 Welcome Reception (Location: Qizhen Hotel)

4/22/2013 Location: Mengminwei Building, Zijingang Campus, Zhejiang University

8:00 - 12:00 Registration

Welcome and Workshop Opening. Chair: Fuchun Zhang

8:30 - 9:00 Opening speeches

Session 1 Correlated electrons: Quantum criticality (I) Chair: Qimiao Si

9:00 - 9:30 Elihu Abrahams Crit i ical quasparticle theory and scaling near a heavy-fermion quantum crit al ic point.

9:30 - 10:00 Silke Paschen Towards a global phase diagram for heavy fermion quantum criticality

10:00 - 10:30 Conference photo & Tea Break

Session 2 Cold atoms – Spin-orbit coupling (I) Chair: Randy Hulet

10:30 - 11:00 Gordon Baym Condensation of bosons with Rashba-Dresselhaus sp in-orbit coup li ng

11:00 - 11:30 Shuai Chen Generation and Exploration of Spin-orbit c oupled Bose gas

11:30 - 12:00 Carlos Sa de Melo Who is the Lord of the Rings in the Zeeman-spin-orbit Saga: Majorana, Dirac or Lifshitz?

12:00 - 14:00 Lunch

Session 3 Correlated electrons: Quantum magnetism Chair: Frank Steglich

14:00 - 14:30 Kazushi Kanoda Spin frustration and Mott criticality in triangular-lattice organics under controlled Mottness

14:30 - 15:00 Manuel Brando A very cool ferromagnet: YbNi4P2

15:00 - 15:30 Yi Zhou Phenomenological theory for Quantum spin liquids

15:30 - 16:00 Tea Break

Session 4 Cold atoms: Fermi-Fermi mixtures. Chair: Giancarlo Strinati

16:00 - 16:30 Rudolf Grimm Second sound and the superfluid fraction in a resonantly interacting Fermi gas (and more news from Innsbruck)

16:30 - 17:00 Subhadeep Gupta Quantum Mixtures of Ytterbium and Lithium Atoms

17:00 - 17:30 Qijin Chen Exotic pairing of ultracold Fermi gases with mass imbalance or long range interactions

18:00 - 20:00 Dinner

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4/23/2013 Location: Mengminwei Building

Session 5 Optical lattices and Spin-orbit couplings Chair: Gordon Baym

8:30 - 9:00 Randy Hulet Quantum Simulation with Atoms in Optical Lattices

9:00 - 9:30 Leo Radzihovsky Reentrant BCS-BEC crossover and a superfluid-insulator transition in optical lattices

9:30 -10:00 Wei Zhang Exotic pairing states in two-dimensional Fermi gases with Rashba spin-orbit coupling

10:00 - 10:30 Tea Break

Session 6 Correlated electrons: Quantum criticality (II) Chair: Manuel Brando

10:30 - 11:00 Qimiao Si Quantum criticality and emergent phases in heavy fermion metals

11:00 - 11:30 Meigan Aronson Yb2Pt2Pb: Emergent Criticality on the Shastry-Sutherland Lattice

11:30 - 12:00 Huiqiu Yuan Field-induced quantum phase transitions and dramatic changes of Fermi-surface in CeRhIn5

12:00 -14:00 Lunch

Session 7 Correlated electrons: Topology and superconductivity Chair: Xin-Cheng Xie

14:00 - 14:30 Matthew Foster Quantum quench in p+ip superfluids: Non-equilibrium topological gapless state(s)

14:30 - 15:00 Chandra Varma Higgs bosons in superconductors

15:00 - 15:30 Hong Yao 2D topological superconductivity by close to type-II van Hove singularity

15:30 -16:00 Tea Break

Session 8 Cold atoms: Spin-orbit couplings (II). Chair: Carlos Sa de Melo

16:00 - 16:30 Wei Yi Unconventional pairing states in a Fermi gas with anisotropic spin-orbit coupling and Zeeman fields

16:30 - 17:00 Jing Zhang Experimental realization of spin-orbit coupled degenerate Fermi gas

17:00 - 17:30 Fuchun Zhang Half metallic bilayer graphene

18:00 - 20:00 Dinner and ICCQM business meeting

4/24/2013 Location: Mengminwei Building

Session 9 Cold atoms: Dipolar Fermi gases. Chair: Rudolf Grimm

8:30 - 9:00 Gora Shlyapnikov Two-dimensional dipolar Fermi liquid

9:00 - 9:30 Meera Parish Stripes and crystalline phases in low-dimensional dipolar gases

9:30 – 10:00 Hui Zhai Spin-1/2 Fermi Gases of Polar Molecules across Dipolar Induced Resonance

10:00 - 10:45 Tea Break

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Session 10 Correlated electrons: Low dimensional systems Chair: Meigan Aronson

10:45 - 11:15 Xin-Cheng Xie Detect spin liquids via spin transport

11:15 - 11:45 Li Sheng Making Quantum Spin-Hall Effect Robust via Magnetic Manipulation

12:00 - 14:00 Lunch

14:00 - 17:30 Excursion (West Lake or Xixi Westland)

18:00 - 21:00 Banquet

4/25/2013 Location: Mengminwei Building

Session 11 Cold atoms: Theory of Fermi gases Chair: Meera Parish

8:30 - 9:00 Jason Ho T he world of large spin particles

9:00 - 9:30 Giancarlo Strinati Equation for the superfluid gap obtained by coarse graining the Bogoliubov-de Gennes equations throughout the BCS-BEC crossover.

9:30 -10:00 Han Pu Localized Impurity in Ultracold Fermi Gas

10:00 - 10:45 Tea Break

Session 12 Novel materials Chair: Matt Foster

10:45 - 11:15 Gabriel Aeppli Orbitronics in Silicon

11:15 - 11:45 Xiaoqiang Xu Spinor Bose-Einstein Condensates Under Synthetic Gauge Field

12:00 - 14:00 Lunch

Session 13 Correlated electrons: Heavy fermions Chair: Chandra Varma

14:00 - 14:30 Frank Steglich CePt 4 Ge 12-x Sb x : from intermediate valence to local moment magnetism

14:30 - 15:00 Xin Lu Tuning the Heavy-Fermion Superconductor CeCoIn 5 with Cd- doping and Pressure

15:00 - 15:30 Chao Cao First principles study of relativistic Mott insulating Li 2 RhO 3

15:30 -16:00 Tea Break

Session 14 Cold atoms: Magnetic atoms and collective modes. Chair: Hui Zhai

16:00 - 16:30 Mingwu Lu Quantum degenerate Bose and Fermi gas of dysprosium

16:30 –17:00 Zhenhua Yu Breathing model of two-dimensional atomic Fermi gases in harmonic traps

Concluding remarks. Chair: Lu Yu

17:00 - 17:30 Lu Yu, Jason Ho --- Summary and concluding remarks

18:00 -20:00 Dinner

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Tutorial lectures on Friday, April 26: (Same conference room)

8:30 – 10:00 Gora Shlyapnikov

Dipolar quantum gases

10:30 – 12:00 Matthew Foster

Classical integrability methods for quantum quenches: BCS dynamics

Poster presentations (Posters may be set up during the tea breaks on April 21. )

Order Author(s) Title

P01 J K Block, N T Zinner and G M Bruun

Density wave instabilities of tilted fermionic dipoles in a multilayer geometry

P02 Yanming Che (车彦明) Reentrant superfluidity in polarized single component Fermi gases with dipolar Interactions

P03 Hua Chen (陈华) Disorder effect at the unitary limit in -superconductors: implications for Zn-doped BaFe2As2 compounds

P04 Xiao-Yong Feng, Jianhui Dai, Chung-Hou Chung, and Qimiao Si

Competing topological and Kondo insulator phases on a honeycomb lattice

P05 B. Huang, A. Zenesini, M. Berninger, H.-C. Nägerl, F. Ferlaino, and R. Grimm

Three-body recombination in a quasi-two-dimensional quantum gas

P06 Yuke Li (李玉科) Superconductivity inducted by La-doping in Sr1-xLaxFBiS2

P07 Jianfang Sun, Bonan Jiang, Guodong Cui, Jun Qian and Yuzhu Wang

Effects of multi-body interaction on the transport of a quantum gas across bosonic superfluid-to-Mott-insulator transition

P08 Jibiao Wang (王继标) Looking for FFLO states in a Fermi-Fermi mixture

P09 Pei Wang (王沛) Momentum distribution functions in ensembles: the inequivalence of microcannonical and canonical ensembles in a finite ultracold system

P10 Fan Wu (吴凡) Unconventional superfluid in a two-dimensional Fermi gas with anisotropic spin-orbit coupling and Zeeman fields

P11 Ren Zhang (张仁) Significance of dressed molecules in a quasi-two-dimensional Fermi gas with spin-orbit coupling

P12 Wei Zhang (张威) Nematic Ferromagnetism on a Lieb lattice

P13 Xiang-Fa Zhou, Guang-Can Guo, Wei Zhang, and Wei Yi

Exotic pairing states in a Fermi gas with three-dimensional spin-orbit coupling

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AbstractsAbstracts

ofof

Invited TalksInvited Talks

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Critical quasiparticle theory and scaling near a heavy-fermion quantum critical point.

Elihu Abrahams

Department of Physics and Astronomy, University of California, Los Angeles, Box 951547, Los Angeles, CA 90095-1547, USA

A theory is given of the scaling behavior of the properties of a three-dimensional metal at an

antiferromagnetic (AFM) critical point. It is shown that the critical spin fluctuations at the AFM

wavevector induce energy fluctuations at small wavevector, giving rise to a diverging quasiparticle

effective mass over the whole Fermi surface. The coupling of the fermionic and bosonic degrees of

freedom leads to a self-consistent relation for the effective mass, which has a strong coupling solution

in addition to the well-known weak-coupling spin-density-wave solution. Critical quasiparticles that

have a scale-dependent effective mass and quasiparticle weight are introduced; these feed back into the

fluctuation spectrum, which develops omega/T scaling. The results for transport and thermodynamics

are in good agreement with data for both YbRhSi and CeCuAu.

(E. Abrahams, J. Schmalian, P. Woelfle, to be published)

2013 Hangzhou Workshop on Quantum Matter Page 13 /65

Towards a global phase diagram for heavy fermion quantum criticality

S. Paschen*

Institute of Solid State Physics, Vienna University of Technology, Austria

Quantum criticality has in recent years emerged as one of the key organizing principles for the

electrons in strongly correlated systems. Heavy fermion compounds are at the forefront of this

research. In recent years efforts are being made to classify the different kinds of quantum critical

behavior experimentally observed, to test the extent to which heavy fermion quantum criticality is

universal. We have identified a cubic heavy fermion material, Ce3Pd20Si6, as exhibiting a field-induced

quantum critical point (QCP) as the lower of two consecutive phase transitions is suppressed to zero. It

is accompanied by an abrupt change of Fermi surface [1], reminiscent of what happens across the

field-induced antiferromagnetic to paramagnetic transition in tetragonal YbRh2Si2 [2]. In Ce3Pd20Si6,

the QCP separates two different ordered phases. In fact, a Kondo breakdown QCP [3] has been

theoretically predicted to exist in the ordered portion of a global phase diagram for quantum critical

heavy fermion compounds [4]. We conclude that dimensionality is an effective way to tune through

such a global phase diagram and that the cubic material studied here is situated in the barely explored

three-dimensional portion of this phase diagram.

*Work done in collaboration with J. Custers, J. Larrea J., K.- A. Lorenzer, M. Müller, A. Prokofiev, A.

Sidorenko, H. Winkler, A. M. Strydom, Y. Shimura, T. Sakakibara, R. Yu and Q. Si.

We acknowledge financial support from the European Research Council (ERC Advanced Grant No

227378).

[1] J. Custers, K.-A. Lorenzer, M. Müller, A. Prokofiev, A. Sidorenko, H. Winkler, A. M. Strydom, Y.

Shimura, T. Sakakibara, R. Yu, Q. Si, and S. Paschen, Nature Materials 11, 189 (2012).

[2] S. Paschen et al., Nature 432, 881 (2004). S. Friedemann et al., Proc. Natl. Acad. Sci. 107, 14547

(2010).

[3] Q. Si et al. Nature 413, 804 (2001). P. Coleman et al., J. Phys. Condens. Matter 13, R723 (2001). T.

Senthil et al., Phys. Rev. B 69, 035111 (2004).

[4] Q. Si, Physica B 378-380, 23 (2006). Q. Si, Phys. Status Solidi B 247, 476 (2010).

2013 Hangzhou Workshop on Quantum Matter Page 14 /65

Condensation of bosons with Rashba-Dresselhaus spin-orbit coupling

Gordon Baym

Department of Physics, University of Illinois, Urbana, Illinois, U.S.A.

This talk will describe recent work on understanding condensation of ultracold bosonic atomic systems

in the presence of a simulated Rashba-Dresselhaus spin-orbit interaction. As will be discussed, this

system is unusual in that at low temperatures interactions stabilize the condensate against quantum and

thermal fluctuations, while at the same time the system also has a possible normal phase. In mean-field

the finite temperature transition to a condensed phase is first order with a jump in the condensate

density.

Generation and Exploration of Spin-orbit coupled Bose gas

Shuai Chen

Center for Quantum Engineering, University of Science and Technology of China, Xiupu Road 99, Pudong New Area, 201315 Shanghai, P. R. China

To generate an artificial gauge field with ultracold quantum gas becomes a very hot topic in last few

years and will continue to be attractive for ultracold atomic and condensed matter physics in the

coming future. Here we present our recent experimental progress of the spin-orbit coupled Bose-

Einstein condensate (BEC) in optical dipole trap. Raman coupling technique and a bias magnetic field

is applied to tune the structure and phase regime and spin-orbit coupling. Several fundamental

properties of spin-orbit coupled BEC is experimentally studied by collective dipole oscillation and the

stability of upper branch. By study the thermal dynamics of the spin-orbit coupled Bose gas, we

construct the phase diagram according to Raman coupling strength with finite temperature

experimentally. These studies enrich the knowledge of this field and further explorations are also in

planning.

2013 Hangzhou Workshop on Quantum Matter Page 15 /65

Who is the Lord of the Rings in the Zeeman-spin-orbit Saga: Majorana, Dirac or Lifshitz?

Carlos A. R. Sa de Melo

Georgia Institute of Technology

I discuss the simultaneous effects of Zeeman and spin-orbit fields during the evolution from BCS to

BEC superfluidity for ultra-cold fermions. I focus on spin-orbit couplings with equal Rashba and

Dresselhaus strengths, and show that topological phase transitions of the Lifshitz class occur through

the emergence of Majorana and/or Dirac fermions as Zeeman and spin-orbit fields are varied.

Topological quantum phase transitions in superfluids with non-s-wave order parameters have been

conjectured theoretically for

p-wave and d-wave systems for many years, but never observed experimentally due to the absence of

tunable parameters. However, Zeeman or spin-orbit fields and interactions can be tuned in the context

of ultra-cold atoms and allow for the visitation of several different phases. For systems with zero

Zeeman field, the evolution from BCS to BEC superfluidity in the presence of spin-orbit effects is only

a crossover [1] as the system remains fully gapped, even though a triplet component of the order

parameter emerges. In contrast, for finite Zeeman fields, spin-orbit coupling induces a triplet

component in the order parameter that produces nodes in the quasiparticle excitation spectrum leading

to bulk topological phase transitions of the Lifshitz type [2]. Additionally, a fully gapped phase exists,

where a crossover from indirect to direct gap occurs. For spin-orbit couplings with equal Rashba and

Dresselhaus strengths the nodal quasi-particles are Dirac fermions that live at and in the vicinity of

rings of nodes. Transitions from and to nodal phases can occur via the emergence of zero-mode

Majorana fermions at phase boundaries, where rings of nodes of Dirac fermions annihilate [3]. Lastly,

I characterize different phases via spectroscopic and thermodynamic properties and conclude that

Lifshitz is the “Lord of the Rings”.

[1] Li Han, C. A. R. Sá de Melo, “Evolution from BCS to BEC superfluidity in the presence of spin-orbit coupling”, Physical Review A 85, 011606(R) (2012), see also arXiv:1106.3613v1.

[2] Kangjun Seo, Li Han and C. A. R. Sá de Melo, “Topological phase transitions in ultra-cold Fermi superfluids: the evolution from BCS to BEC under artificial spin-orbit fields”, Physical Review A 85, 033601 (2012), see also arXiv:1108.4068v2.

[3] Kangjun Seo, Li Han and C. A. R. Sá de Melo, “Artificial spin-orbit coupling in ultra-cold Fermi superfluids”, arXiv:1110.6364v1.

[4] Kangjun Seo, Li Han, and C. A. R. Sá de Melo, “Emergence of Majorana and Dirac Particles in Ultracold Fermions via Tunable Interactions, Spin-Orbit Effects, and Zeeman Fields”, Physical Review Letters 109, 105303 (2012), see also arXiv:1201.0177v1.

2013 Hangzhou Workshop on Quantum Matter Page 16 /65

Spin frustration and Mott criticality in triangular-lattice organics under controlled Mottness

Kazushi Kanoda

Department of Applied Physics, University of Tokyo, Hongo 7-3-1, Tokyo 113-8656, Japan

Mott transition is a phenomenon in the charge degrees of freedom resulting from the competition

between the Coulomb interactions and kinetic energy. When the lattice is triangular,

antiferromagnetically interacting spins suffer from geometrical frustration against ordering; so, the

correlated electrons on triangular lattice in the vicinity of Mott transition are in an intriguing situation

where both the charge and spin degrees of freedom possibly exhibit quantum fluctuations. The family

of organic conductors, κ-(ET)2X, are modeled to half-filled band systems with quasi-triangular lattices,

of which the geometrical frustration is varied with X. In this workshop, I show experimental results on

two Mott transitions; one is from an antiferromagnet and the other from a spin liquid. At low

temperatures, they have different aspects; the Mott transition from the antiferromagnet has the strong

first-order nature and accompanies the so-called pseudogap followed by relatively high-Tc

superconductivity, whereas the transition from a spin liquid is weak and going without pseudogap and

with low-Tc superconductivity. At high temperatures well above the Mott critical endpoint, however,

the two Mott transitions have things in common with respect to the criticality. Referring to the recent

DMFT calculations, the observed criticality may be quantum in nature. I will also show the

experimental signatures indicating the pressure-induced quantum phase transition in a doped

triangular-lattice.

2013 Hangzhou Workshop on Quantum Matter Page 17 /65

A very cool ferromagnet: YbNi4P2

Manuel Brando

Max Planck Institute for Chemical Physics of Solids, N othnitzer Str. 40, 01187 Dresden, Germany�(brando@cpfs.mpg.de)

Heavy fermion (HF) systems are metals where the weak hybridisation between nearly localized f-

electrons and the mobile conduction electrons, i.e. the Kondo eect, leads to a Fermi liquid (FL) ground

state with narrow bands and quasiparticles with strongly enhanced eective electronic masses. When the

magnetic RKKY interaction becomes comparable to the Kondo interaction, magnetic order can appear,

mostly at very low T. The magnetic order can be suppressed by an external parameter, e.g. pressure or

magnetic eld, inducing a quantum phase transition (QPT) at T = 0. If this QPT is continuous, the

associated quantum critical point (QCP) is surrounded by a non-FL regime of quantum critical

uctuations where unconventional superconductivity or novel phases of matter may arise [1].

The unambiguous observation of antiferromagnetic (AFM) QCPs in HF systems [2] has led to an

increasing number of theoretical and experimental works in order to understand QPTs as deeply as

their classical counterpart. Although it has been demonstrated that in antiferromagnets QCPs exist, in

ferromagnets there is still no clear evidence. Intensive investigations have shown that metallic

ferromagnets are inherently unstable [3, 4] and do not exhibit a FM QCP. However, in the recently

discovered HF system YbNi4P2, a quasi-1D ferromagnet with a remarkably-low TC = 0:15K [5], the

T-divecgence in the Gr uneisen ratio [6] points to the presence of a FM QCP. I will present a general�

overview of the state of the art of FM quantum criticality in HF systems, discussing in particular the

case of YbNi4P2 [5, 7].

References

[1] H. Q. Yuan et al., Science 302 2104 (2003)[2] J. Custers et al., Nature 424 524 (2003)[3] D. Belitz et al., Phys. Rev. Lett. 82 4707 (1999)[4] M. Uhlarz et al., Phys. Rev. Lett. 93 256404 (2004)[5] C. Krellner et al., New J. Phys. 13 103014 (2011)[6] L. Zhu et al., Phys. Rev. Lett. 91 066404 (2003)[7] A. Steppke et al., Science 339 933 (2013)

2013 Hangzhou Workshop on Quantum Matter Page 18 /65

Phenomenological theory for Quantum spin liquids

Yi Zhou (周毅)

Department of Physics, Zhejiang University

We study quantum spin liquid states (QSLs) at the vicinity ofmetal-insulator transition. Assuming

that the low energy excitations in the QSLs are labeled by “spinon” occupation numbers with the same

Fermi surface structure as in the corresponding metal (Fermi-liquid) side, we propose a

phenomenological Landau-like low energy theory for the QSLs and show that the usual U(1) QSLs

with spinon Fermi surface is a representative member of this class of spin liquids. Based on our

effective low energy theory, an alternative picture to the Brinkman-Rice picture of Mott metal-

insulator transition is proposed. The charge, spin and thermal responses of QSLs are discussed under

such a phenomenology.

Second sound and the superfluid fraction in a resonantly interacting Fermi gas (and more news from Innsbruck)

Rudi Grimm

Institut für Quantenoptik und Quanteninformation (IQOQI), Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria and Institut fur Experimentalphysik und Zentrum fur Quantenphysik, Universit at Innsbruck, 6020 �Innsbruck, Austria

I will present our recent results on ultracold Fermi gases with tunable interactions. In a gas of Li-6

atoms, we have observed `second sound', which is a striking manifestation of the two-component

nature of a superfluid. Second sound corresponds to an entropy wave, where the superfluid and the

non-superfluid components oscillate in opposite phase, different from ordinary sound (`first sound'),

where they oscillate in phase. Our measurements of the second-sound speed allow us to extract the

temperature dependence of the superfluid fraction, which in strongly interacting quantum gases has

been an inaccessible quantity so far. In a mixture of Li-6 and K-40, we have studied atom-dimer

interactions by radio-frequency spectroscopy. We have observed an attraction on the repulsive side of

the Feshbach resonance, which represents a unique consequence of a few-body phenomenon and only

occurs in systems with mass imbalance.

2013 Hangzhou Workshop on Quantum Matter Page 19 /65

Quantum Mixtures of Ytterbium and Lithium Atoms

Subhadeep Gupta

University of Washington, Department of Physics, Box 351560, 3910 15th Ave NE, Seattle, WA 98195-1560

We have produced quantum degenerate mixtures of ytterbium (Yb) and lithium (Li) atoms. Such a

mass-mismatched mixture can be useful for various studies in few- and many-body physics.

Furthermore, this combination (of an alkaline-earth-like and an alkali atom) also forms the starting

point for the production of ultracold paramagnetic polar molecules, with proposed applications in

quantum simulation, quantum information science, and precision tests of fundamental physics. In

addition to our production procedures, I will also report on our study of the collisional stability of the

Yb-Li mixture in the vicinity of a Li Feshbach resonance. In our experiment, Yb can be prepared as

either a bath for or a probe of the strongly interacting Li Fermi gas. I will also discuss the prospects

for tunable inter-species interactions and the YbLi molecule.

Exotic pairing of ultracold Fermi gases with mass imbalance or long range interactions

Qijin Chen

Department of Physics, Zhejiang University, Hangzhou 310027, China

In this talk I will discuss the exotic pairing of ultracold atomic Fermi gases, in the presence of a long

range interaction or between atoms of different masses, such as 6Li and 40K. We find that, as the

interaction strength increases from weak to strong, for long range interactions, the effective high

density makes the superfluid transition temperature Tc vanish at intermediate pairing strengths, where

ordinary BCS-type ground states should now give way to a pair density wave state, and then recover as

the pairing strength further increases. Such behaviors exist for both long range s-wave pairing as well

as p-wave pairing with dipole-dipole interactions. When pairing takes place in a Fermi-Fermi mixture,

exotic phase separation, along with pseudogap phenomena, are predicted when the mixture are

confined in traps. Our calculations in the homogeneous case indicates that the Fulde-Ferrell-Larkin-

Ovchinnikov state has a substantially large phase space than in equal mass pairing cases. This makes

the detection of FFLO states much easier experimentally.

2013 Hangzhou Workshop on Quantum Matter Page 20 /65

Quantum Simulation with Atoms in Optical Lattices

Randall G. Hulet

Rice University, Department of Physics and Astronomy, Houston, TX

Some of the most complex and vexing issues in electronic materials are modeled by extremely simple

Hamiltonians. High-temperature superconductors, for example, may arise from magnetic interactions

in a Mott insulating state, described by the simple Hubbard model. The Hubbard model stipulates that

particles (electrons in the case of superconductors) are distributed in a square lattice where they can

hop from site to site with a tunneling energy t, and where they may interact with occupied nearest

neighbor sites with interaction energy U. No one knows whether this simple “hydrogen-atom” model

actually gives rise to the d-wave pairing underlying the cuprate superconductors.

I will describe two experiments that use ultracold atoms in an optical lattice as stand-ins for the

electrons in ionic lattices: 1) the Hubbard model in 3D; and 2) the polarized spin-½ Fermi gas in 1D.

In the first experiment, we are searching for the anti-ferromagnetic Mott insulating state that is

expected to exist above the superconducting transition when there is exactly one-atom per lattice site.

We have used Bragg scattering of near-resonant light to characterize the lattice, and will use a spin-

sensitive variant of this tool to detect magnetic correlations. In the second experiment, we have used

an optical lattice in two-dimensions to create a bundle of 1D tubes containing an imbalanced two spin-

state mixture of 6Li fermions. The phase diagram of this system contains three phases: a fully-paired

superfluid, a fully-polarized ferromagnet, and a partially polarized state that is predicted to be the

exotic FFLO superfluid state, for which the pairs have non-zero center of mass momentum.

2013 Hangzhou Workshop on Quantum Matter Page 21 /65

Reentrant BCS-BEC crossover and a superfluid-insulator transition in optical lattices

Leo Radzihovsky

Physics Department, CB 390, University of Colorado, Boulder, CO 80309-0390

I will discuss aspects of paired superfluidity in Feshbach-resonant Fermi gases in optical lattices[1,2].

Focusing on a deep optical lattice, I will show that for more than half-filled band the gas exhibits a

reentrant crossover with decreased detuning, from a paired BCS superfluid to a BEC of molecules of

holes, back to the BCS superfluid, and finally to a conventional BEC of diatomic molecules. This

behavior is associated with the non-monotonic dependence of the chemical potential on detuning. This

leads to a variety of interesting experimental predictions. For a single filled band a quantum phase

transition from an insulator to a BCS-BEC superfluid replaces the crossover. The corresponding phase

diagram is mapped out.

[1] Z. Shen, L. Radzihovsky, V. Gurarie, Phys. Rev. Lett., 109, 245302 (2012).[2] J. von Stecher, V. Gurarie, L. Radzihovsky, A. M. Rey, Phys. Rev. Lett. 106, 235301 (2011).

Exotic pairing states in two-dimensional Fermi gases with Rashba spin-orbit coupling

Wei Zhang

Renmin University of China

We study the stability region of the topological superfluid phase in a trapped 2D polarized Fermi gas

with Rashba spin-orbit coupling (SOC) and across a BCS-BEC crossover. We systematically study the

structure of the phase separation and investigate in detail the optimal parameter region for the

preparation of the topologically non-trivial superfluid phase. In the highly polarized case, we also

show that SOC gives rise to a pairing instability for arbitrary interaction strength. In the weak-coupling

limit, the pairing instability leads to a Fulde-Ferrel-Larking-Ovchinnikov (FFLO)-like molecular state,

which undergoes first-order transition into conventional pairing state when the SOC increases or when

the interaction is tuned stronger. These pairing states are metastable against a polaron state dressed by

particle-hole fluctuations for small SOC strength. At large SOC, a polaron-molecule transition exists,

which suggests a phase transition between the topological superfluid state and the normal state in a

highly polarized Fermi gas.

2013 Hangzhou Workshop on Quantum Matter Page 22 /65

Quantum criticality and emergent phases in heavy fermion metals

Qimiao Si

Rice University

Quantum criticality is being explored in a variety of correlated electron systems, as a mechanism

for non-Fermi liquid behavior and unconventional superconductivity. During the past decade, much

new insight has been derived from heavy fermion metals. We have theoretically studied the interplay

between the quantum fluctuations of local-moment magnetism and the Kondo effect involving

itinerant electrons. The resulting global phase diagram classifies quantum critical points, providing the

distinction between “standard” quantum critical behavior that fit into the textbook Landau framework

and “beyond-Landau” quantum criticality. This global phase diagram has also motivated a flurry of

recent experiments on heavy fermion materials with varied dimensionality or geometrically frustrated

lattices. I will summarize the theoretical efforts, and discuss their implications for unconventional

superconductivity at the border of antiferromagnetism.

2013 Hangzhou Workshop on Quantum Matter Page 23 /65

Yb2Pt2Pb: Emergent Criticality on the Shastry-Sutherland Lattice

Meigan Aronson

Stony Brook University and Brookhaven National Laboratory

Metallic Yb2Pt2Pb forms in the U2Pt2Sn structure, with layers of Yb ions forming the orthogonal

dimers of the Shastry-Sutherland lattice (SSL). The Yb3+ moments are strongly Ising-like, with an

energetically isolated doublet ground state. Fits to the temperature dependent susceptibility confirm

that dimerization occurs, and that the B=0 energy separation of the singlet ground state and the triplet

excited state ∆ ~4-5 K. Yb2Pt2Pb orders antiferromagnetically at 2.06 K, with a SDW-type modulation

of the dimer moments with two wave vectors qAF=(0.2,±0.2,0) rlu. The Yb moments are oriented

perpendicular to the (1,±1,0) dimer bond directions, and the dimers form the rungs of two orthogonal

spin ladders along the c-axis. A nondispersing and inelastic excitation with energy ~0.6 meV is found

for wave vectors in the SSL plane, in good agreement with the singlet-triplet gap ∆ inferred from

susceptibility measurements. The dispersion of the excitations along (00l) closely resembles that of a

spinon continuum, such as those found in spin chain compounds. Magnetic fields suppress both the

excitations and the static moments in one ladder, while the ladder whose Ising moments are

perpendicular to the field retains its one-dimensional character. Yb2Pt2Pb is a unique system, where

strong quantum fluctuations related to the spin-ladder or SSL characters of this compound may lead to

unusual correlations in this excellent metallic host.

This research was carried out in collaboration with L. S. Wu, I. Zaliznyak, M. –S. Kim, J. Lynn, Y. Qiu, G. Ehlers, M. Gamza, and J. W. Simonson. Work at Stony Brook University is supported by the National Science Foundation under grant DMR-0907457.

Coauthors:M. C. Aronson1,2, Liusuo Wu1, I. Zaliznyak2,M. S. Kim1, J. Lynn3, Y. Qiu3, G. Ehlers4, M. Gamza2, and J.W. Simonson1.1 Department of Physics and Astronomy, Stony Brook University, Stony Brook NY 11794, USA.2 Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.3 NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Dr., Gaithersburg, MD 20899, USA.4 Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge TN, 37831, USA

2013 Hangzhou Workshop on Quantum Matter Page 24 /65

Field-induced quantum phase transitions and dramatic changes of Fermi-surface in CeRhIn5

H. Q. Yuan

Department of Physics and Center for Correlated Matter, Zhejiang University, China

The heavy fermion compound CeRhIn5 provides a prototype system for studying unconventional

superconductivity and quantum phase transitions. A dramatic change of Fermi surface was previously

reported at the pressure-induced quantum critical point when superconductivity is suppressed by

applying a sufficiently high magnetic field [1], which has been proposed to support the scenario of

local quantum critical point (QCP) [2]. We have performed measurements of quantum oscillations and

specific heat at low temperatures and in magnetic fields across the ambient-pressure field-induced

antiferromagnetic QCP (Bc0≈50T) of CeRhIn5. Direct evidence is obtained for a sharp reconstruction of

the Fermi surface as a function of magnetic field inside the antiferromagnetic state of CeRhIn5. New

Fermi surface branches with large cyclotron masses are observed around 40T, which is likely

attributed to the delocalization of Ce-4f electrons in a magnetic field. Our findings are consistent with

a spin-density-wave type QCP and implicate multiple universality classes of QCPs in the field-

pressure phase diagram of this compound.

In collaboration with L. Jiao, T. Shang, B. H. Fu, Y. Chen (ZJU),Y. Kohama, R. E. Baumbach ， E. D. Bauer, J. Singleton, M. Jaime, J. D. Thompson (LANL), F. Steglich (MPI-CPfS/ZJU)

References [1] H. Shishido, R. Settai, H. Harima, Y. Ōnuki, J. Phys. Soc. Jpn. 74, 1103 (2005).[2] P. Gegenwart, Q. Si and F. Steglich, Nature Phys. 4, 186 (2008).

2013 Hangzhou Workshop on Quantum Matter Page 25 /65

Quantum quench in p+ip superfluids: Non-equilibrium topological gapless state(s)

Matthew S. Foster

Physics & Astronomy Department, Rice University, 6100 Main MS-61Houston, Texas 77005-1827

Ground state "topological protection" has emerged as a main theme in quantum condensed matter

physics. A key question is the robustness of physical properties including topological quantum

numbers to perturbations such as disorder or non-equilibrium driving. In this work we investigate the

dynamics of a p+ip superfluid following a zero temperature quantum quench. The model describes a

2D topological superconductor with a non-trivial (trivial) BCS (BEC) phase. Proposed experimental

realizations include ultracold atomic and molecular gases. We work with the full interacting BCS

Hamiltonian, which we solve exactly in the thermodynamic limit using Liouville integrability. The

non-equilibrium phase diagram is obtained for generic quenches. A large region of the phase diagram

describes strong to weak-pairing quenches wherein the order parameter vanishes in the long-time limit,

due to pair fluctuations. Despite this, we find that the pseudospin winding number survives for

quenches in this regime, leading to the prediction of a "gapless topological" state.

Higgs Bosons in Superconductors

Chandra Varma

University of California, Riverside.

Spurred by some strange experimental observations in some superconductors, the theory of a new

collective mode in superconductors and how it can be experimentally found very easily under certain

circumstances was provided in 1981. It was called the "Amplitude Mode" to distinguish it from the

"Phase Modes" which provide Josephson eects and which in homogeneous superconductors are

coupled to charge density uctuations and are at the energies of the plasmons. More generally, this

mode is the amplitude mode of a particle-hole symmetric U(1) eld, i.e the model treated by Higgs and

others in the1960's whose generalizations have played an important role in the standard model of

particle physics. Recently the amplitude or Higgs mode for d-wave superconductors have also been

discussed, where its various cousins may also be found.

I will tell the story of the above and why such modes were missed in the theory of superconductivity

for so long and the applications of the ideas about such modes for cold bosons and fermions in optical

lattices. I will also comment, as a very interested outsider and an enthusiast, on the Higgs in particle

physics being discovered at LHC from the point of view of the theory of superconductivity.

2013 Hangzhou Workshop on Quantum Matter Page 26 /65

2D topological superconductivity by close to type-II van Hove singularity

Hong Yao

Institute for Advanced Study, Tsinghua University, Beijing 100084

We study 2D electronic systems whose Fermi surfaces have type-II van Hove saddle points, defined as

saddle points residing at time-reversal-noninvariant momenta in Brillouin zone. We propose that triplet

pairing is generically favored in such 2D systems in the presence of weak repulsive interactions. This

is argued quite generally from a renormalization group treatment of these systems. Such triplet pairing

could give rise to topological superconductivity with robust boundary chiral or helical Majorana

fermions. Possible applications to the Bi-case superconductor LaOBiS2 will also be discussed.

Unconventional pairing states in a Fermi gas with anisotropic spin-orbit coupling and Zeeman fields

Wei Yi

Key Laboratory of Quantum Information, University of Science and Technology of China,CAS, Hefei, Anhui, 230026, People's Republic of China

We study the exotic pairing states in a two-dimensional ultracold Fermi gas with the synthetic spin-

orbit coupling (SOC) that has recently been realized at the National Institute of Standards and

Technology (NIST). Because of the coexistence of anisotropic SOC and effective Zeeman fields in the

NIST scheme, the system shows a rich structure of phase separation involving exotic gapless

superfluid states and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing states with different center-of-

mass momenta. In particular, we characterize the stability region of FFLO states and demonstrate their

nontrivial features under SOC. Unlike conventional FFLO states in a polarized Fermi gas without

SOC, these FFLO states are induced by the coexistence of SOC and Fermi surface deformation, and

have intriguing features like first-order transitions between different FFLO states, nodal FFLO states

with gapless contours in momentum space, and the existence of an exotic fully gapped FFLO states.

Based on our understanding of these pairing states in the weak coupling limit, we expect that they are

not limited to the case of NIST SOC, and should generally exist in systems with SOC and Fermi

surface deformation. The various interesting features reported here may be probed, for example, by

measuring the in situ density profiles or by the momentum-resolved radio-frequency spectroscopy.

2013 Hangzhou Workshop on Quantum Matter Page 27 /65

Experimental realization of spin-orbit coupled degenerate Fermi gas

Jing Zhang

The State Key Laboratory of Quantum Optics and QuantumOptics Devices, Institute of Opto-Electronics, Shanxi University,Taiyuan 030006, P.R. China

We report the first experimental realization of SO coupled degenerate Fermi gas. Evidences of

spin-orbit coupling have been obtained from the Raman Rabi oscillation and the spin-dependent

momentum distribution asymmetry. We also find that the momentum distribution in helical bases is

consistent with topological changes of Fermi surfaces. Recently, we bring the system close to a

Feshbach resonance where the s-wave interaction becomes strongly attractive. This progress enables

us to study stronger pairing and higher Tc enhanced by SO coupling in resonant interacting Fermi

gases and topological insulator and topological superfluid in a more flexible setup in near future.

References:

[1] P. Wang, Z. Yu, Z. Fu, J. Miao, L. Huang, S. Chai, H. Zhai, J. Zhang, Phys. Rev. Lett. 109, 095301 (2012)[2] P. Wang, Z. Fu, L. Huang, J. Zhang, Phys. Rev. A 85, 053626 (2012).[3] Z. Fu, P. Wang, L.i Huang, Z. Meng, J. Zhang, Phys. Rev. A 86, 033607 (2012).

Two-dimensional dipolar Fermi liquid

G.V. Shlyapnikov

Laboratoire de Physique Theorique et Modeles Statistique, Universite Paris-Sud XIBat. 100, 91405 Orsay Cedex, France

I will discuss a novel two-dimensional Fermi liquid of dipoles (polar molecules or atoms with a large

magnetic moment) which are tilted at a certain angle with respect to the plane of their translational

motion. It will be shown that only many-body (non-mean field) effects provide a correct description of

zero sound. Relying on the calculation of the dynamical structure factor, the relaxation rate of

quasiparticles, and the damping rate of zero sound, I will show wide possibilities for the observation of

zero sound modes in experiments.

2013 Hangzhou Workshop on Quantum Matter Page 28 /65

Stripes and crystalline phases in low-dimensional dipolar gases

Meera M Parish

London Centre for Nanotechnology, Gordon Street, London, WC1H 0AH, United Kingdom

Ultracold atomic gases provide an exceptionally clean and controllable system in which to explore

quantum many-body phenomena. Thus far, the focus has been on short-range interactions, since these

well describe atom-atom scattering in the low energy limit. However, the recent creation of polar

molecules with electric dipole moments has ignited interest in long-range dipolar interactions and the

possibility of new exotic phases.

In this talk, I will examine the behavior of polar molecules confined to low-dimensional geometries,

where the dipole moments are all aligned by an external electric field. For a two-dimensional gas of

dipolar fermions, I will show that the system can spontaneously break rotational symmetry and form a

density wave (or stripe phase) for sufficiently strong repulsive interactions [1], thus providing a model

example of a density wave that is purely driven by repulsion rather than, e.g., distortions of an

underlying lattice. I will also discuss the effects of different geometries on density wave and crystalline

phases [2,3].

[1] M. M. Parish & F. M. Marchetti, Phys. Rev. Lett. 108, 145304 (2012).[2] F. M. Marchetti & M. M. Parish, Phys. Rev. B 87, 045110 (2013).[3] M. Bauer & M. M. Parish, Phys. Rev. Lett. 108, 255302 (2012).

2013 Hangzhou Workshop on Quantum Matter Page 29 /65

Spin-1/2 Fermi Gases of Polar Molecules across Dipolar Induced Resonance

Hui Zhai

Institute for Advanced Study, Tsinghua University, Beijing 100084

In this talk I will discuss spin-1/2 dipolar Fermi gas of polar molecules. I shall first introduce "dipolar

induced resonance". Through the coupling between s-wave and higher partial wave, dipolar interaction

induces an effective -1/r^4 potential in s-wave channel, which can generate scattering resonances as

dipolar strength increases. We shall emphasize that this resonance, in contrast to Feshbach resonance,

has a positive effective range, and we shall highlight the consequence of this effective range. We will

also discuss many-body crossover physics across the "dipolar induced resonance". Surprisingly, an

isotropic spin singlet paring will emerge from the anisotropic dipolar interaction at resonance, which

also has a universal interaction energy. Away from resonance, there will be a transition from singlet

superfluid to triplet superfluid. Nearby the transition, a singlet-triplet mixed phase with spontaneously

breaking of time-reversal symmetry will take place.

References

1. s-wave-scattering Resonances induced by Dipolar Interactions of Polar Molecules, Zhe-Yu Shi, Ran Qi and Hui Zhai, Physical Review A, (Rapid Communications), 85, 020702 (2012)

2. Fermion Pairing across a Dipolar Interaction induced Resonance, Ran Qi, Zhe-Yu Shi and Hui Zhai, Physical Review Letters, 110, 045302 (2013)

Detect spin liquids via spin transport

X.C. Xie

International Center for Quantum Materials and School of Physics, Peking University

In the "spinon Fermi sea" state proposed for the organic spin liquid candidates, there will be a Fermi

surface of fermionic spin-1/2 spinons. Specific heat and thermal conductivity measurements indeed

suggest the existence of Fermi surfaces in these Mott insulators. However they do not directly prove

these are formed by the spinons. In this talk we propose a measurement that would simultaneously

show the existence of Fermi surfaces and their spin-carrying nature. Our proposal is to measure the

spin current flowing through a metal-spin liquid-metal junction, similar to a recent measurement of

spin current through a ferrimagnetic insulator[Nature 464, 262 (2010)]. We will show that different

Mott insulating states can in principle be distinguished by different power law relations between spin

current and spin bias.

2013 Hangzhou Workshop on Quantum Matter Page 30 /65

Half metallic bilayer graphene

Fu-Chun Zhang

University of Hong Kong and Zhejiang University

Charge neutral bilayer graphene has a gapped ground state as transport experiments demonstrate. One

of the plausible such ground states is layered antiferromagnetic spin density wave state, where the

spins in top and bottom layers have the same amplitudes but opposite signs. We propose that lightly

charged bilayer graphene in an interlayer electric field may be a half metal as a consequence of the

inversion and particle-hole symmetry broken in a layered antiferromagnetic state. We show this

explicitly by using a mean field theory on a 2-layer Hubbard model to describe the graphene system.

Reference: "Half Metallic Bilayer Graphene", by Jie Yuan, Dong-Hui Xu, Hao Wang, Yi Zhou, Jinghua Gao, and Fu-Chun Zhang, arXiv:1302.7123

Making Quantum Spin-Hall Effect Robust via Magnetic Manipulation Li Sheng, H. C. Li, R. Shen, L. B. Shao, B. G. Wang, D. Y. XingNational Laboratory of Solid State Microstructures andDepartment of Physics, Nanjing University, Nanjing 210093, China and D. N. ShengDepartment of Physics and Astronomy, California StateUniversity, Northridge, California 91330, USA The quantum spin Hall (QSH) effect is known to be unstable to perturbations violating time-reversal

symmetry. We show that creating a narrow ferromagnetic (FM) region near the edge of a QSH sample

can push one of the counterpropagating edge states to the inner boundary of the FM region, and leave

the other at the outer boundary, without changing their spin polarizations and propagation directions.

Since the two edge states are spatially separated into different ``lanes'', the QSH effect becomes robust

against symmetry-breaking perturbations. We present both qualitative discussion and quantitative

calculation to demonstrate the physical picture and practical feasibility of this proposal.

2013 Hangzhou Workshop on Quantum Matter Page 31 /65

The world of large spin particles

Tin-Lun (Jason) Ho

The Ohio State University & Tsinghau University

In recent years, increasing many experiments have produced quantum degenerate bosons and fermions

with large spins. In this talk, we shall discuss how some of the fundamental phenomena such as Bose

condensation, BEC pairing, spin ordering, and some strongly correlated phenomena will look like for

high spin particles. In addition, we also point out the serious heating problem in current experiments

on spin-orbit coupled alkali atoms will not occur for high spin particles such as Dysprosium.

Equation for the superfluid gap obtained by coarse graining the Bogoliubov-de Gennes equations throughout the BCS-BEC crossover.

Giancarlo Strinati

Dipartimento di Fisica, Universita di Camerino, I-62032 Camerino, Italy

A non-linear (LPDA) differential equation for the gap parameter of a superfluid Fermi system is

obtained by performing a suitable coarse graining of the Bogoliubov-de Gennes (BdG) equations for

any coupling throughout the BCS-BEC crossover and from zero temperature up to the critical

temperature, aiming at replacing the time-consuming solution of the original BdG equations by the

simpler solution of this novel equation. A favorable numerical test for the practical validity of this new

equation is performed over most the temperature-coupling phase diagram, by an explicit comparison

with the full solution of the original BdG equations for an isolated vortex. The LPDA equation reduces

both to the Ginzburg-Landau equation for Cooper pairs in weak coupling close to the critical

temperature and to the Gross-Pitaevskii equation for composite bosons in strong coupling at low

temperature.

2013 Hangzhou Workshop on Quantum Matter Page 32 /65

Localized Impurity in Ultracold Fermi Gas

Han Pu

Department of Physics and Astronomy, Rice University, 6100 Main Street, Houston, Texas 77005, USA

One of the salient features of ultracold atomic systems is that they are intrinsically clean. Nevertheless,

artificial impurities can be engineered in atomic systems, which allows one to investigate their effects.

In this talk, I will discuss our recent work on the effects of a localized impurity potential on atomic

Fermi gases. Such an impurity can be used to manipulate or probe exotic quantum phases of fermionic

superfluids. For example, it can be exploited to create the FFLO state in a controlled manner or to

realize Majorana edge state in a topological Ferm gas with Rashba spin-orbit coupling.

Orbitronics in Silicon

Gabriel Aeppli

Department of Physics and Astronomy, University College London Gower Street, London WC1E 6BT, United Kingdom

Condensed matter physics is following atomic physics in moving from observation of quantum states

to their control, initially via variables such as external magnetic fields, but more recently using tailored

optical and microwave pulses and, at the level of a few atoms, using electrical fields generated by scan

probe tips. These developments, which also include deterministic doping of semiconductors, will

enable both new quantum many body physics as well as novel information processing schemes. In

particular, we describe the control and observation of coherent superpositions of defect orbitals in

silicon using both scanning tunneling microscopy and pulsed THz radiation generated by the Dutch-

UK free electron laser FELIX. The results are contrasted with those for control of defect spins.

References

Greenland et al., Nature (2010); http://www.nature.com/nature/journal/v465/n7301/full/nature09112.html

Vinh et al., PRX (2013) http://prx.aps.org/abstract/PRX/v3/i1/e011019

Morley et al, Nature Materials (2010 and 2013)http://www.nature.com/nmat/journal/v9/n9/full/nmat2828.html and http://www.nature.com/nmat/journal/v12/n2/full/nmat3499.html

Schofield et al., Nature Comm. (2013) http://www.nature.com/ncomms/journal/v4/n4/full/ncomms2679.html

2013 Hangzhou Workshop on Quantum Matter Page 33 /65

Spinor Bose-Einstein Condensates Under Synthetic Gauge Field

Xiao-Qiang Xu

Department of Physics, Hangzhou Normal University, Hangzhou, P. R. China

Due to the recent popularity of synthetic gauge field in ultracold atoms, I will talk about the combined

effects of Rashba spin-orbit coupling and rotation in spin-1/2 condensates. Nontrivial structures appear

in the ground state wave function, such as half-quantum vortices [1]. Additionally, I will show the

interesting mapping between pure Rashba BECs and magnets with Dzyaloshinskii-Moriya (DM)

interaction [2].

[1] Xiao-Qiang Xu and Jung Hoon Han, Phys. Rev. Lett. 107, 200401 (2011).[2] Xiao-Qiang Xu and Jung Hoon Han, Phys. Rev. Lett. 108, 185301 (2012).

CePt4Ge12-xSbx: from intermediate valence to local moment magnetism

F. Steglich§

Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

In the filled skutterudite CePt4Ge12, the Ce ions are in a weakly-intermediate valent (IV) state. Partially

substituting Sb for Ge, one (i) adds extra conduction electrons and (ii) expands the average unit-cell

volume [1]. This leads to the reduction of the Kondo energy scale and the emergence of magnetism.

The T – x phase diagram includes various ground states, namely, a "light" Fermi liquid of IV

CePt4Ge12-xSbx (0 ≤ x < 0.8), an extended non-Fermi liquid phase (around x = 1), a "heavy" Fermi

liquid (1.1 < x < 1.5) and antiferromagnetic order at higher Sb concentration up to, at least, x = 3. The

striking dissimilarity of this phase diagram with the generic phase diagram of quantum-critical heavy-

fermion metals [2] is discussed, with special emphasis on the role of disorder.

§ In collaboration with: M. Nicklas, S. Kirchner, R. Borth, R. Gumeniuk, W. Schnelle, H. Rosner, H.

Borrmann, A. Leithe-Jasper and Yu. Grin.

[1] M. Nicklas et al., Phys. Rev. Lett. 109, 236405 (2012).

[2] J. Custers et al., Nature 424, 524 (2003).

2013 Hangzhou Workshop on Quantum Matter Page 34 /65

Tuning the Heavy-Fermion Superconductor CeCoIn5 with Cd-doping and Pressure

Xin Lu

Zhejiang University, Hangzhou 310027, China

CeCoIn5 is a well-known heavy fermion superconductor showing quantum critical behavior at ambient

pressure. A small amount of Cd-doping in CeCoIn5 readily destroys the superconductivity and induces

long-range antiferromagnetic (AFM) order. It is assumed that pressure would reversibly tune Cd-

doped CeCoIn5 back to its original quantum critical state. In this talk, we show that, even though AFM

is gradually suppressed under pressure with the emergence of superconductivity, no magnetic quantum

critical behaviors are observed in either electrical resistivity or heat capacity measurements around the

assumed critical pressure. A possible scenario for the AFM order is that the doped Cd defects nucleate

spin droplets in the critical superconductor CeCoIn5 and these droplets form long-range magnetic order

when they overlap in space. The size of the droplets shrinks and they lose long range magnetic order

with the recovery of superconductivity as pressure tunes CeCoIn5 away from its natural

superconducting critical point. The 115In nuclear quadrupolar resonance spectra for 1% Cd-doped

CeCoIn5 under pressure support the existence of spin droplets even when AFM is completely

suppressed.

This work is in collaboration with T. Park, S. Seo, J.-X. Zhu, R. R. Urbano, N. Curro, L. D. Pham, E. D. Bauer, Z. Fisk and J. D. Thompson.

First principles study of relativistic Mott insulating Li RhO

Chao Cao

Hangzhou Normal University

Motivated by studies of coexisting electron correlation and spin-orbit coupling effect in Na2IrO3 and a

recent experiment of its 4d analogue Li2RhO3, we performed first-principles calculations of the

rhodium oxide compound. The experimentally observed ground state of Li2RhO3 can be recovered

only if both spin-orbit coupling and on-site Coulomb interaction are taken into consideration. Within

the proper U range for 4d-orbitals ( eV), the ground state of Li could be either

zigzag-AFM or stripy-AFM, both yielding energy gap close to experimental observation. Furthermore,

the total energy differences between the competing magnetic phases are meV/Rh within

eV, manifesting strong magnetic frustration in the compound. Finally, the phase energy of

Li RhO cannot be fitted with the two-dimensional Heisenberg-Kitaev model involving only the

nearest neighbor interactions, and we propose that inter-layer interactions may be responsible for the

discrepancy.

2013 Hangzhou Workshop on Quantum Matter Page 35 /65

Quantum degenerate Bose and Fermi gas of dysprosium

Mingwu Lu

Stanford University

Advances in the quantum manipulation of ultracold atomic gases are opening a new frontier in the

quest to better understand strongly correlated matter. By exploiting the long-range and anisotropic

character of the dipole-dipole interaction, we hope to create novel forms of soft quantum matter,

phases intermediate between canonical states of order and disorder. Our group recently created Bose

and Fermi quantum degenerate gases of the most magnetic element, dysprosium, which should allow

investigations of quantum liquid crystals. We present details of recent experiments that created the first

degenerate dipolar Fermi gas as well as the first strongly dipolar BEC in low field. BECs of Dy will

form the key ingredient in novel scanning probes using atom chips. We are developing a Dy cryogenic

atom chip microscope that will possess unsurpassed sensitivity and resolution for the imaging of

condensed matter materials exhibiting topologically protected transport and magnetism.

Breathing model of two-dimensional atomic Fermi gases in harmonic traps

Zhenhua Yu

Institute for Advanced Study, Tsinghua University, Beijing 100084

Two dimensional many-body systems with a contact interaction have a SO(2,1) at the classical

level. For two-dimensional (2D) atomic Fermi gases, including quantum effects, the SO(2,1)

symmetry is broken explicitly via the contact correlation operator. Consequently the frequency of the

breathing mode of the 2D Fermi gas in harmonic traps can be different from , with the

trapping frequency of harmonic potentials. At zero temperature, we use the sum rules of density

correlation functions to yield upper bounds for . We further calculate through the Euler

equations in the hydrodynamic regime. The obtained value of satisfies the upper bounds and shows

deviation from which can be as large as about 8%.

2013 Hangzhou Workshop on Quantum Matter Page 36 /65

PosterPoster   

PresentationsPresentations

2013 Hangzhou Workshop on Quantum Matter Page 37 /65

Density wave instabilities of tilted fermionic dipoles in a multilayer geometry

J K Block1, N T Zinner and G M Bruun

Department of Physics and Astronomy, Aarhus University, Denmark

We consider the density wave instability of fermionic dipoles aligned by an external field, and moving in equidistant layers at zero temperature. Using a conserving Hartree-Fock approximation, we calculate the critical coupling strength for the formation of density waves as a function of the dipole orientation and the distance between the layers and also consider the effect of a non-zero layer width. We find that exchange correlations within each layer suppress the density wave instability significantly2.Conversely, interactions between dipoles in different layers enhance the density wave instability. This effect, which is strongest when the dipoles are oriented perpendicular to the planes, causes the density waves in neighboring layers to be in-phase for all orientations of the dipoles. We demonstrate that the effects of the interlayer interaction can be understood from a simple classical model.

Left: Dipolar molecules are confined to quasi 2D layers by means of a deep one dimensional optical lattice and aligned by an external electric field. Right: For a typical layer separation d=1064 nm/2 and perpendicular alignment θ =0, the critical value of dipole moment times the square root of the mass, p√m, as a function of the square root of the density. Vertical lines: p√m for five dipolar fermionic molecules of alkali metals.

1 Contact: jkblock@phys.au.dk2 Block J K, Zinner N T and Bruun G M (2012): Density wave instabilities of tilted fermionic dipoles

in a multilayer geometry. New J. Phys. 14 105006.

2013 Hangzhou Workshop on Quantum Matter Page 38 /65

Reentrant Superfluidity in Polarized Single Component Fermi Gases with Dipolar Interactions

Yanming Che and Qijin Chen

Department of Physics, Zhejiang University

Quantum degenerate polar molecules and atoms have been made available experimentally [1][2], which provide a platform for exploring new phases of quantum gases where dipole-dipole interaction (DDI) plays a dominant role. In contrast to the widely studied isotropic and short range interactions in dilute atomic gases, the DDI is of long range and spatially anisotropic. The relative DDI strength can be tuned via external electrical field in the case of polar molecules or via tuning the Fermi energy (or density) in the case of magnetic atoms. Existing theories on dipolar superfluidity are mostly based on mean field treatments, which are inadequate in treating the moderate and strong coupling regimes. Here we study theoretically the superfluidity of polarized single component 3D dipolar Fermi gases from weak to strong coupling regimes, within a pairing fluctuation theory[3][4]. Effects of finite temperature and pseudogap are addressed. One remarkable phenomenon is the re-entrant behavior of Tc in the T-g phase diagram, where g is the DDI strength. There exists a range of DDI where the system favors a pair density wave (or supersolid) state rather than Bose-Einstein condensation of pairs of zero momentum. This phenomenon is a result of the interplay of the long range nature and anisotropic properties of DDI. Transport properties including superfluid density and heat capacity below Tc are calculated as well, throughout the BCS-BEC crossover. When a 3D isotropic harmonic trap is included using a local density approximation (LDA), the density profile broadens with increasing temperature whereas it shrinks with increasing DDI strength, similar to its s-wave counterpart.

References:

[1] Mingwu Lu, Nathaniel Q. Burdick, and Benjamin L. Lev, Phys.Rev. Lett. 108, 215301 (2012).[2] K.-K. Ni, S. Ospelkaus, D. Wang, G. Quemener, B. Neyenhuis, M. H. G. de Miranda, J. L. Bohn, J. Ye, D. S. Jin, Nature 464, 1324-1328 (2010) [3] Q. J. Chen, J. Stajic, S. N. Tan, and K. Levin, Phys. Rep. 412, 1(2005).[4] Q. J. Chen, Ioan Kosztin, Boldizsar Janko, K. Levin, Phys. Rev. Lett. 81, 4708 (1998).

2013 Hangzhou Workshop on Quantum Matter Page 39 /65

Disorder effect at the unitary limit in -superconductors: implications for Zn-doped BaFe2As2 compounds

Hua Chena, Jianhui Daib, and Jian-Xin Zhuc

a) Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University, Hangzhou 310027, China

b) Condensed Matter Group, Department of Physics, Hangzhou Normal University, Hangzhou 310036, China

c) Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Motivated by recent experiments on Zn-doped 122-type iron pnictides, we investigate the disorder effects caused by non-magnetic impurities at the strong (unitary) impurity scattering limit in a superconductor with the -pairing symmetry. The spatially unrestricted Bogoliubov-de Gennes equation is solved self-consistently based on a minimal two-band model with varying impurity concentration. It is shown that the superconductivity is more fragile than the magnetic order against the single impurity scattering. With increasing impurity concentrations the density of states shows a typical gap filling feature, revealing the impurity-induced pair breaking effect. Moreover, both the disorder configuration averaged gap amplitude and superfluid stiffness are dramatically suppressed towards the dirty limit indicating the Cooper pair localization. We find that the superconducting phase is fully suppressed at critical impurity concentration . These results are in agreement with experiments on the Zn-doped BaFe2As2 compound.

Competing topological and Kondo insulator phases on a honeycomb lattice

Xiao-Yong Feng^{a}, Jianhui Dai^{a}, Chung-Hou Chung^{b,c}, and Qimiao Si^{d}

a) Condensed Matter Group, Department of Physics, Hangzhou Normal University, Hangzhou 310036, Chinab) Electrophysics Department, National Chiao-Tung University, HsinChu, Taiwan 300, China c) National Center for Theoretical Sciences, HsinChu, Taiwan 300, Chinad) Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA

We investigate the competition between the spin-orbit interaction of itinerant electrons and their Kondo coupling with local moments densely distributed on the honeycomb lattice. We find that the model at half-filling displays a quantum phase transition between topological and Kondo insulators at a nonzero Kondo coupling. In the Kondo-screened case, tuning the electron concentration can lead to a new topological insulator phase. The results suggest that the heavy-fermion phase diagram contains a new regime with a competition among topological, Kondo-coherent and magnetic states, and that the regime may be especially relevant to Kondo lattice systems with -conduction electrons. Finally, we discuss the implications of our results in the context of the recent experiments on SmB implicating the surface states of a topological insulator, as well as the existing experiments on the phase transitions in SmB under pressure and in CeNiSn under chemical pressure.

2013 Hangzhou Workshop on Quantum Matter Page 40 /65

Three-body recombination in a quasi-two-dimensional quantum gas

B. Huang,1 A. Zenesini,1 M. Berninger,1 H.-C. Nägerl,1 F. Ferlaino,1 and R. Grimm1,2

1 Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria 2 Institut für Quantenoptik und Quanteninformation (IQOQI), Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria

Collisional properties of interacting particles can dramatically change when the dimensionality of the system is reduced. One intriguing example is the disappearance of the weakly bound trimers known as Efimov states in two dimensions. Many open questions remain about the details of the crossover from three to two dimensions and how the Efimov-related three-body recombination losses are affected. We use ultracold cesium atoms trapped tightly in a harmonic potential along one spatial direction to realize a quasi-two-dimensional system with tunable confinement and tunable interactions. In our latest results, we succeed to trace a smooth transition of the three-body recombination rate from a three-dimensional to a nearly two-dimensional system, in good agreement with recent theoretical models.

Superconductivity induced by La doping in Sr1-xLaxFBiS2 system

Xi Lin, Xinxin Ni, Bin Chen, Xiaofeng Xu, Xuxin Yang, Jianhui Dai, Yuke Li, Xiaojun Yang, Yongkang Luo, Qian Tao, Guanghan Cao and Zhuan Xu;

Department of Physics, Hangzhou Normal University, Hangzhou 310036, ChinaState Key Lab of Silicon Materials and Department of Physics, Zhejiang University, Hangzhou 310027, China

Through a combination of X-ray diffraction, electrical transport, magnetic susceptibility and heat capacity measurements, we report the effect of La doping on Sr in the newly discovered SrFBiS2 system. Superconducting transition with critical temperature Tc of 2.8 K, developed from a semiconducting-like normal state, was found in Sr0.5La0.5FBiS2. A strong diamagnetic signal and a clear specific heat anomaly associated with this transition were observed, confirming bulk superconductivity. The upper critical field Hc2(0) was estimated to be 1 Tesla by using the Ginzburg-Landau approach. Our experiments therefore demonstrate that bulk superconductivity can be achieved by electron doping in the SrFBiS2 system.

Keywords: BiS2-based superconductor; Hall effect; Specific Heat.

2013 Hangzhou Workshop on Quantum Matter Page 41 /65

Effects of multi-body interaction on the transport of a quantum gas across bosonic superfluid-to-Mott-insulator transition

Jianfang Sun, Bonan Jiang, Guodong Cui, Jun Qian* and Yuzhu Wang

Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China*Email: jqian@siom.ac.cn

Ultracold atoms in an optical lattice offer a unique setting for quantum simulation of interacting many-body systems. As is well known, an important milestone was the observation of superfluid (SF) to Mott insulator (MI) transition, which stimulated a variety of novel quantum phases. In most cases, only the lowest band has to be considered in a standard Bose-Hubbard model (BHM), however, renormalized multi-band effect has been measured in quantum phase revival spectroscopy [1] and was also demonstrated to play an essential role in photon-assisted tunneling [2]. In addition, extensive studies focus on non-equilibrium dynamics of a strongly correlated system with trapped atoms in optical lattices, and especially relaxation time scale [3]. Now we are interested in non-equilibrium dynamics of a bosonic lattice gas in the presence of multi-body interaction. In this work, we explore the effects of the attractive three-body interaction on the phases of the system at equilibrium and non-equilibrium dynamics across the SF-MI transition. By means of Gutzwiller mean-field theory, we numerically obtain phase diagram of the modified BH Hamiltonian and find several intriguing results, such as the expansion of the central insulator plateaus and even the emergence of a new plateaus at the center. In addition, we investigate the transport of the atoms and predict a slower relaxation time which is attributed to the effect of the multi-body interaction on mass transport.

[1] S. Will, T. Best, U. Schneider, L. Hackermüller, D.-S. Lühmann, I. Bloch, Nature 465, 192 (2010) [2] R. Ma, M. E. Tai, P. M. Preiss, W. S. Bakr, J. Simon, and M. Greiner, Phys. Rev. Lett. 107, 095301

(2011).[3] S. Natu, K. R. A. Hazzard, and E. J. Mueller, Phys. Rev. Lett. 106, 125301 (2011).

Looking for FFLO states in a Fermi-Fermi mixture

Jibiao Wang

Department of Physics, Zhejiang University, Hangzhou 310027, China

Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states have been of great interest in the study of population imbalanced atomic Fermi gases. It has been known that the phase space of FFLO states for an equal-mass Fermi gas in three dimensions (3D) is rather small and thus has not been observed experimentally. Here we discuss these states in a homogeneous mixture, as well as for other mass ratios, as they undergo the BCS--BEC crossover, using a pairing fluctuation theory. We find that when is majority, a stable FFLO phase persists throughout the BCS through BEC regimes, with the population imbalances evolving from small to large. In contrast, when is the majority, a stable FFLO phase exists only in the BCS regime. We also find that the phase space of stable FFLO states becomes substantially larger as the mass ratio increases at unitarity. This should make it easier to detect such states in experiment.

2013 Hangzhou Workshop on Quantum Matter Page 42 /65

Momentum distribution functions in ensembles: the inequivalence of microcannonical and canonical ensembles in a finite ultracold system

Pei Wang

Zhejiang University of Technology

It is demonstrated that in many thermodynamic textbooks the equivalence of the different ensembles is achieved in the thermodynamic limit. In this present work we remark the inequivalence of microcan-nonical and canonical ensembles in a finite ultracold system at low energies. We calculate the microca-nonical and canonical momentum distribution function (MDF) in a system of identical fermions (bo-sons). The canonical MDF is the Fermi-Dirac (Bose-Einstein) function, while the microcanonical MDF deviates from the canonical one in a finite system at low energies where the single-particle dens-ity of states and its inverse are finite.

Unconventional superfluid in a two-dimensional Fermi gas with anisotropic spin-orbit coupling and Zeeman fields

Fan Wu,1 Guang-Can Guo,1 Wei Zhang,2 Wei Yi1

1Key Laboratory of Quantum Information, University of Science and Technology of China,CAS, Hefei, Anhui, 230026, People's Republic of China and2Department of Physics, Renmin University of China, Beijing 100872, People's Republic of China

We study the phase diagram of a two-dimensional unlracold Fermi gas with the synthetic spin-obit coupling that has recently been realized at NIST. Due to the coexistence of SOC and the effective Zeeman fields in the NIST scheme, the system shows rich structure of phase separation involving exotic gapless superfluid and Fulde-Ferrell-Larkin-Ovchinnikov pairing states with different center-of-mass momentum. In particular, we characterize the stability region of the FFLO states and demonstrate their unique features under SOC. We then show that the effective transverse Zeeman field in the NIST scheme can qualitatively change the landscape of the thermodynamic potential which leads to intriguing effects, such as the disappearance of the pairing instability, the competition between different FFLO states, and the stabilization of an FFLO state with a particular center-of-mass momentum over a large parameter region. These interesting features may be probed for example by measuring the in situ density profiles or by the momentum-resolved rf spectroscopy.

Reference: Fan Wu, Guang-Can Guo, Wei Zhang, Wei Yi, Phys. Rev. Lett. 110, 110401 (2013).

2013 Hangzhou Workshop on Quantum Matter Page 43 /65

Significance of dressed molecules in a quasi-two-dimensional Fermi gas with spin-orbit coupling

Ren Zhang (张仁)

Department of Physics, Renmin University of China, Beijing 100872, People's Republic of China

We investigate the properties of a spin-orbit coupled quasi-two-dimensional Fermi gas with tunable s-wave interaction between the two spin species. By analyzing the two-body bound state, we find that the population of the excited states in the tightly confined axial direction can be significant when the two-body binding energy becomes comparable to or exceeds the axial confinement. Since the Rashba spin-orbit coupling that we study here tends to enhance the two-body binding energy, this effect can become prominent at unitarity or even on the BCS side of the Feshbach resonance. To study the impact of these excited modes along the third dimension, we adopt an effective two-dimensional Hamiltonian in the form of a two-channel model, where the dressed molecules in the closed channel consist of the conventional Feshbach molecules as well as the excited states occupation in the axial direction. With properly renormalized interactions between atoms and dressed molecules, we find that both the density distribution and the phase structure in the trap can be significantly modified near a wide Feshbach resonance. In particular, the stability region of the topological superfluid phase is increased. Our findings provide a proper description for a quasi-two-dimensional Fermi gas under spin-orbit coupling, and are helpful for the experimental search for the topological superfluid phase in ultracold Fermi gases.

Nematic Ferromagnetism on a Lieb lattice

Wei Zhang

Department of Physics, Remin University of China, Beijing 100872, China

We discuss the properties of ferromagnetic orders on the Lieb lattice and show that a symmetry protected quadratic-flat band crossing point will dramatically affect the magnetic ordering. In the presence of a weak on-site repulsive interaction, we find that the ground state is a nematic ferromagnetic order with simultaneous broken of time-reversal and rotational symmetries. When the interaction strength increases, the rotational symmetry will restore at a critical value, and the system enters a conventional ferromagnetic regime. We also find out that the mean-field transition temperatures for both the nematic and conventional ferromagnetic phases are of the order of interaction. This observation suggests that these magnetic orders have the potential to be realized and detected in cold atomic systems within realistic experimental conditions.

2013 Hangzhou Workshop on Quantum Matter Page 44 /65

Exotic pairing states in a Fermi gas with three-dimensional spin-orbit coupling

Xiang-Fa Zhou,1 Guang-Can Guo,1 Wei Zhang,2, and Wei Yi1,

1Key Laboratory of Quantum Information, University of Science and Technology of China,CAS, Hefei, Anhui, 230026, People’s Republic of China2Department of Physics, Renmin University of China, Beijing 100872, People’s Republic of China

We investigate properties of exotic pairing states in a three-dimensional Fermi gas with three dimensional spin-orbit coupling and an effective Zeeman field. The interplay of spin-orbit coupling, effective Zeeman field and pairing can lead to first-order phase transitions between different phases, and to interesting nodal superfluid states with gapless surfaces in the momentum space. We then demonstrate that pairing states with zero center-of-mass momentum are unstable against Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states, with a finite center-of-mass momentum opposite to the direction of the effective Zeeman field. Unlike conventional FFLO states, these FFLO states are induced by the coexistence of spin-orbit coupling and Fermi surface deformation, and have intriguing features like first-order transitions between different FFLO states, nodal FFLO states with gapless surfaces in momentum space, and exotic fully gapped FFLO states. With the recent theoretical proposals for realizing three-dimensional spin-orbit coupling in ultracold atomic gases, our work is helpful for the future experimental studies, and provides valuable information for the general understanding of pairing physics in spin-orbit coupled fermionic systems.

Reference:[1] Xiang-Fa Zhou, Guang-Can Guo, Wei Zhang, and Wei Yi, arXiv:1302.1303[2] X.-J. Liu and H. Hu, arXiv:1302.0553.[3] L. Dong, L. Jiang, and H. Pu, arXiv:1302.1189.

2013 Hangzhou Workshop on Quantum Matter Page 45 /65

List of Participants

Invited Speakers, Organizers and Committee Members:

Elihu AbrahamsDepartment of Physics and AstronomyUniversity of California, Los AngelesBox 951547, Los Angeles, CA 90095-1547, USAabrahams@physics.ucla.edu

Gabriel AeppliDepartment of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United KingdomE-Mail: gabriel.aeppli@ucl.ac.uk ; ucapgae@ucl.ac.uk        URL: http://www.cmmp.ucl.ac.uk/people/aeppli.html

Meigan AronsonBuilding 703, 50 Rutherford Dr. PO Box 5000 Upton, NY 11973-5000 Email: Meigan.Aronson@stonybrook.edu

Gordon Baym Department of Physics, University of Illinois1110 West Green Street, Urbana, IL 61801-3080Email: gbaym@illinois.edu

Manuel BrandoMax Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, GermanyE-Mail: Manuel.Brando@cpfs.mpg.de URL: http://www.cpfs.mpg.de/web/forschung/forschbere/festkoerpphys/brando/

Chao Cao (曹超)Condensed Matter Physics Group, Department of Physics,Hangzhou Normal UniversityHangzhou 310036, ChinaEmail: ccao@hznu.edu.cn

Qijin Chen (陈启谨)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: qchen@jfi.uchicago.edu URL: http://zimp.zju.edu.cn/~qchen/

Shuai Chen (陈帅)Center for Quantum EngineeringUniversity of Science and Technology of ChinaXiupu Road 99, Pudong New Area, Shanghai 201315, P. R. ChinaEmail: shuai1975@gmail.com

2013 Hangzhou Workshop on Quantum Matter Page 46 /65

Jianhui Dai (戴建辉)Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: daijh@hznu.edu.cn

Matt Foster Department of Physics and Astronomy, Rice University 6100 Main Street, Houston, Texas 77005, USAEmail: Matthew.Foster@rice.edu

Rudi GrimmInstitut für Quantenoptik und Quanteninformation (IQOQI),Österreichische Akademie der Wissenschaften, 6020 Innsbruck, AustriaInstitut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, AustriaEmail: rudolf.grimm@uibk.ac.at

Subhadeep Gupta University of WashingtonDepartment of Physics, Box 3515603910 15th Ave NE, Seattle, WA 98195-1560

Email: deepg@u.washington.edu

Jason Tin-Lun HoDepartment of Physics, Ohio State University191 W. Woodruff Avenue, Columbus, Ohio 43210, USAEmail: jasontlho@gmail.com

Randy HuletDepartment of Physics and Astronomy, Rice University 6100 Main Street, Houston, Texas 77005, USAEmail: randy@rice.edu

Kazushi KanodaDepartment of Applied Physics, University of Tokyo,Bunkyo City, Tokyo, 113-8656, JapanEmail: kanoda@ap.t.u-tokyo.ac.jp

Kathryn LevinJames Franck Institute and Department of Physics, University of Chicago929 E 57th Street, Chicago, IL 60637, USAEmail: levin@jfi.uchicago.edu

Xin Lu (路欣)Department of Physics, Zhejiang University 38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: xinluphy@zju.edu.cn

Mingwu Lu (吕铭悟)Department of Applied Physics, Stanford University, Stanford, CA 94305, USAEmail: mwlu@stanford.edu

2013 Hangzhou Workshop on Quantum Matter Page 47 /65

Jianwei Pan (潘建伟)Center for Quantum Engineering, University of Science and Technology of ChinaXiupu Road 99, Pudong New Area, Shanghai 201315, P. R. ChinaEmail: pan@ustc.edu.cn

Meera M. ParishLondon Centre for Nanotechnology, Gordon Street, London, WC1H 0AH, United KingdomEmail: meera.parish@ucl.ac.uk

Silke PaschenInstitute of Solid State Physics, Vienna University of Technology 1040 Vienna, Austria Email: silke.buehler-paschen@tuwien.ac.at

Han Pu (浦晗)Department of Physics and Astronomy -- MS 61, Rice University, 6100 Main Street, Houston, Texas 77005, USA Email:hpu@rice.edu URL: http://cohesion.rice.edu/naturalsciences/physics/FacultyDetail.cfm?RiceID=1263

Leo Radzihovsky Department of Physics, CB 390University of ColoradoBoulder, CO 80309-0390, USAEmail: radzihov@colorado.edu

Carlos Sa de Melo School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USAEmail: carlos.sademelo@physics.gatech.edu

Li Sheng (盛利)National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China Email: shengli@nju.edu.cn

Gora V. ShlyapnikovLaboratoire de Physique Theorique et Modeles StatistiqueUniversite Paris-Sud XIBat. 100, 91405 Orsay Cedex, FranceEmail: shlyapn@lptms.u-psud.fr

Qimiao Si (斯其苗)Department of Physics and Astronomy -- MS 61, Rice University, 6100 Main Street, Houston, Texas 77005, USAE-Mail:qmsi@rice.edu URL: http://cohesion.rice.edu/naturalsciences/physics/FacultyDetail.cfm?RiceID=705

Frank SteglichMax Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, GermanyE-Mail: frank.steglich@cpfs.mpg.de URL: http://www.cpfs.mpg.de/departments/physics/steglich-seite_en.html

2013 Hangzhou Workshop on Quantum Matter Page 48 /65

Giancarlo C. StrinatiDipartimento di Fisica, Universita di CamerinoI-62032 Camerino, ItalyEmail: giancarlo.strinati@unicam.it

John E ThomasPhysics Department, NC State University, Box 8202 Raleigh, NC 27695, USAEmail: john_thomas@ncsu.edu

Chandra Varma Department of Physics and Astronomy, University of California, Riverside, California 92521, USA Email: chandra.varma@ucr.edu URL: http://www.physics.ucr.edu/faculty_staff/faculty_pages/varma.html

Xin-Cheng Xie (谢心澄)International Center for Quantum Materials6th Floor, Science Building 5, Peking UniversityNo.5 Yiheyuan Road, Haidian District, Beijing 100871Email: xcxie@pku.edu.cn

Xiaoqiang Xu (徐晓强)Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: xiaoqiang.hsu@gmail.com

Zhu'an Xu (许祝安)Department of Physics, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: zhuan@zju.edu.cn

Hong Yao (姚宏)Institute for Advanced Study, Tsinghua University, Beijing 100084, China Email: yaohong@tsinghua.edu.cn

Wei Yi (易为)Key Laboratory of Quantum Information, University of Science and Technology of China,CAS, Hefei, Anhui, 230026, ChinaEmail: wyiz@ustc.edu.cn

Lu Yu (于渌)Institute of Physics, Chinese Academy of Sciences, 8 3rd South Street, Zhongguancun, Haidian District, P. O. Box 603, Beijing 100080, ChinaEmail: lyu@aphy.iphy.ac.cn

Zhenhua Yu (俞振华)Institute for Advanced StudyTsinghua University, Beijing 100084, China Email: zhenhua.yu@nbi.dk, huazhenyu2000@gmail.com

Huiqiu Yuan (袁辉球)Department of Physics, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: hqyuan@zju.edu.cn

2013 Hangzhou Workshop on Quantum Matter Page 49 /65

Hui Zhai (翟荟)Institute for Advanced Study, Tsinghua University, Beijing 100084, ChinaEmail: huizhai.physics@gmail.com

Jing Zhang (张靖)State Key Laboratory of Quantum Optics and Quantum Optics DevicesInstitute of Opto-ElectronicsShanxi University, Taiyuan 030006, ChinaEmail: jzhang74@sxu.edu.cn

Fu-Chun Zhang (张富春)Department of Physics, Hong Kong University, Pokfulam Road, Hong Kong, orDepartment of Physics, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: fuchun@hkucc.hku.hk

Wei Zhang (张威)Department of Physics, Remin University of ChinaBeijing 100872, ChinaEmail: wzhang@ruc.edu.cn

Yi Zhou (周毅)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang University38 Zheda Road, Hangzhou, Zhejiang 310027, ChinaEmail: yizhou76@hku.hk

Participants with a poster presentation

Jens Kusk Block Department of Physics and Astronomy , Aarhus University Ny Munkegade 120, Room 1520-629 8000 Aarhus C , Denmark Email: jkblock@gmail.com

Hua Chen (陈华)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang UniversityHangzhou, Zhejiang 310027, ChinaEmail: hwachanphy@gmail.com

Yanming Che (车彦明)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang UniversityHangzhou, Zhejiang 310027, ChinaEmail: cherym@zju.edu.cn

Xiao-Yong Feng (封晓勇)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang UniversityHangzhou, Zhejiang 310027, ChinaEmail: 13777574737@163.com

2013 Hangzhou Workshop on Quantum Matter Page 50 /65

Bo HuangInstitut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, AustriaEmail: Bo.Huang@uibk.ac.at

Yuke Li (李玉科)Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: yklee@hznu.edu.cn

Jun Qian (钱军)Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaEmail: jqian@siom.ac.cn

Jibiao Wang (王继标)Zhejiang Institute of Modern Physics and Department of Physics, Zhejiang UniversityHangzhou, Zhejiang 310027, ChinaEmail: wangjibiao@zju.edu.cn

Pei Wang (王沛)Zhejiang University of TechnologyEmail: wangpei@zjut.edu.cn

Fan Wu (吴凡)Key Laboratory of Quantum Information, University of Science and Technology of China,Hefei, Anhui 230026, ChinaEmail: wuf6366@mail.ustc.edu.cn

Ren Zhang (张仁)Renmin University of ChinaBeijing 100872, ChinaEmail: rine.zhang@gmail.com　　　　　　　　　　　　　　　　　　　

Xiang-Fa Zhou (周祥发)Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui, 230026, ChinaEmail: xfzhou@ustc.edu.cn

Other participants

Guanghan Cao (曹光旱)Department of Physics, Zhejiang UniversityHangzhou 310027, ChinaEmail: ghcao@zju.edu.cn

Lee Chang (张礼)Institute for Advanced Study, Tsinghua University, Beijing 100084, ChinaEmail: zl-dmp@mail.tsinghua.edu.cn

2013 Hangzhou Workshop on Quantum Matter Page 51 /65

Bin Chen (陈斌)Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: chenbinguanxin@hotmail.com

Yu Chen (陈宇)Institute for Advanced Study, Tsinghua University, Beijing 100084, ChinaEmail: spaceexplorer@163.com 　　

Zhu Chen (陈竹)Institute for Advanced Study, Tsinghua University, Beijing 100084, ChinaEmail: cz-male@163.com

Xiaoling Cui (崔晓玲)Institute for Advanced Study, Tsinghua University, Beijing 100084, ChinaEmail: xlcui.phys@gmail.com

Hang Dong (董行)Fudan UniversityEmail: 10110190032@fudan.edu.cn

Xiao-Yong Feng (封晓勇)Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: 13777574737@163.com

Jinhua Gao (高锦华)Department of Physics, Huazhong University of Science and TechnologyEmail: jinhua@hust.edu.cn

Xianlong Gao (高先龙)Department of Physics, Zhejiang Normal UniversityJinhua, Zhejiang, ChinaEmail: gaoxl@zjnu.edu.cn

Liming GuanInstitute for Advanced Study, Tsinghua University, Beijing 100084, ChinaEmail: Lmguan.phys@gmail.com

Hao Guo (郭昊)Department of Physics, Southeast UniversityNanjing 211189, ChinaEmail: guohao.ph@gmail.com

Jesper Fredenslund LevinsenTCM group, Cavendish Laboratory19 JJ Thomson AvenueCambridge CB3 0HE, UKEmail: jfl36@cam.ac.uk

2013 Hangzhou Workshop on Quantum Matter Page 52 /65

Kang Li (李康)Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: kangli60@yahoo.com.cn

Xiaolin Li (李晓林)Shanghai Institute of Optics and Fine Mechanics390 Qinghe Road, Jiading, Shanghai 201800, ChinaEmail: Xiaolin_li@siom.ac.cn

Bang-Gui Liu (刘邦贵)Institute of Physics, Chinese Academy of SciencesEmail: bgliu@iphy.ac.cn

Boyang Liu (刘波杨)Institute of Physics, Chinese Academy of SciencesEmail: boyang@iphy.ac.cn

Fanglong Ning (宁凡龙)Department of Physics, Zhejiang UniversityHangzhou 310027, ChinaEmail: ningfl@zju.edu.cn

Jun Qian (钱军)Shanghai Institute of Optics and Fine MechanicsEmail: jqian@siom.ac.cn

Lei Shu (殳蕾)Fudan University, Advanced Material Building R3082205 Songhu Road, Shanghai, ChinaEmail: leishu@fudan.edu.cn

Jun WangZhejiang Normal UniversityEmail: wangjun89@foxmail.com

Dong-Hui Xu (许东辉)Department of Physics, Zhejiang UniversityHangzhou 310027, ChinaEmail: donghueixu@gmail.com

Xiaofeng Xu (许晓峰)Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: phyxxf@hotmail.com

Ju-Kui Xue (薛具奎)College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, ChinaEmail: xuejk@nwnu.edu.cn Jinhu Yang (杨金虎) Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: yjhchina@yahoo.com.cn

2013 Hangzhou Workshop on Quantum Matter Page 53 /65

Xuchen Yang (杨旭辰)South China Normal UniversityEmail: 563384379@qq.com

Xing-Can Yao Shanghai Branch, University of Science and Technology of ChinaXiuPu 99, New PuDong District, Shanghai, 201315, ChinaEmail: yaoxingcan@gmail.com

Quanlin Ye (叶全林)Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: qlye@hznu.edu.cn

Shunli Yu (于顺利)Department of Physics, Nanjing universityEmail: slyu@nju.edu.cn

Danwei Zhang (张丹伟)South China Normal UniversityEmail: zdanwei@126.com

Tianbao Zhang (张天宝)Zhejiang Normal UniversityJinhua, Zhejiang Province, ChinaEmail: zhangtianbao0529@gmail.com

Wei Zheng Institute for Advanced Study, Tsinghua University, Beijing 100084, ChinaEmail: zhengwei8796@gmail.com

Nengji Zhou (周能吉)Department of Physics, Hangzhou Normal UniversityHangzhou, Zhejiang 310036, ChinaEmail: zhounengjismall@163.com

Xiangfa Zhou (周祥发)Key lab of quantum information, USTC, Hefei, Anhui, ChinaEmail: xfzhou@ustc.edu.cn

Yuan Zhou (周苑)Department of Physics, Nanjing universityEmail: zhouyuan@nju.edu.cn

2013 Hangzhou Workshop on Quantum Matter Page 54 /65

Student Participants

Institution Name Email

Beijing Normal University

Tiantian Zhang (张田田) ttz@mail.bnu.edu.cnBinxing Lian 201011141014@mail.bnu.edu.cn

Neng Liu (刘能) liunengbnu@163.com

Hui Shao (邵慧) shaohui192@126.com

Innsbruck University Bo Huang Bo.Huang@uibk.ac.at

Ohio State UniversityWeiran Li (李蔚然) weiran.li@gmail.com

Biao Huang (黄飙) Phys.huang.biao@gmail.com

Renmin University of China

Keji Chen (陈科技) chenkeji2010@gmail.com

Jinlong Wang (王金龙) Wangjinlong9788@163.com

Ren Zhang (张仁) Rine.zhang@gmail.com

Institute for Advanced Study, Tsinghua University

Chao Feng (冯超) Fcln0218@mail.ustc.edu.cn

Chao Gao (高超) gaochao42@gmail.com

Jiao Miao miao.physics@gmail.com

Zhe-Yu Shi (史哲雨) Shizy07@mails.tsinghua.edu.cn

South China Normal UniversityXuchen Yang（杨旭辰） 563384379@qq.com

Danwei Zhang（张丹伟） zdanwei@126.com

University of Science and Technology of China

Wangwei Lan (蓝汪伟) isalanka@hotmail.com

Xiwang Luo (罗希望) luoxw@mail.ustc.edu.cn

Fan Wu (吴凡) wuf6366@mail.ustc.edu.cn

Zhejiang Normal University

Ahai Chen chenahaiphysics@gmail.com

Jie Chen chenquantumchaos@yahoo.cn

Jun Wang wangjun89@foxmail.com

Tianbao Zhang (张天宝) zhangtianbao0529@gmail.com

Hangzhou Normal University

Hui Chen (陈辉) Chenhui19861228q@126.com

Yuxiang Li (李宇祥) yuxiang.sx@163.com

Yi Liu (刘艺) 1451321768@qq.com

Yunshuang Ye (叶云霜) yeyunshuang@126.com

Chenchao Xu (徐陈超) 1024697025@qq.com

Zhejiang University

Jinke Bao (鲍金科) baojk7139@zju.edu.cn

Yanming Che (车彦明) cherym@zju.edu.cn

Jian Chen chenjian123@zju.edu.cn

Qian Chen (陈倩) jiang__ai@163.com

Ye Chen (陈晔) xiaochenyeye@gmail.com

Cui Ding (丁翠) dingcui@zju.edu.cn

Binhao Fu fubinhao@gmail.com

Chunyu Guo (郭春煜) cooperuin@sina.com

Lunhui Hu (胡仑辉) hu.lunhui.zju@gmail.com

Ningju Hui（惠宁菊） huiningju@163.com

Peng Huo 3090104535@zju.edu.cn

Wenbing Jiang wbjiangphy@gmail.com

Wenhe Jiao (焦文鹤) wenhejiao@gmail.com

2013 Hangzhou Workshop on Quantum Matter Page 55 /65

Zhejiang University

Nan Li (李楠) ln_zju@zju.edu.cn

Xiao Lin (林效) xiao.lin0628@gmail.com

Ye-Hua Liu (刘冶华) yhliu@zju.edu.cn

Yongkang Luo (罗永康) mpzslyk@gmail.com

Huiyuan Man (满会媛) huiyuan653@gmail.com

Jianjian Miao (苗舰舰) miaojianjian@zju.edu.cn

Chuan Qin cheenc@zju.edu.cn

Chenyi Shen kissscy@zju.edu.cn

Tian Shang (商恬) shangtianphy@zju.edu.cn

Yunlei Sun (孙云蕾) 3060601213@zju.edu.cn

Zhoufei Tang (唐舟飞) tangzhoufei@gmail.com

Hangdong Wang (王杭栋) wanghdphys@gmail.com

Haochuan Wang (汪皓川) whc@zju.edu.cn

Jibiao Wang (王继标) wangjibiao@gmail.com

Qi Wang (王琪) 3100104262@zju.edu.cn

Tenghui Wang zzxht3@gmail.com

Zongfa Weng (翁宗法) zjuweng@z ju.edu.cn

Kepan Xie lilunwuli13@163.com

Zhouxiang Xu Zhouxiang001.cn@gmail.com

Qiang Yang (杨强) 21106101@zju.edu.cn

Qinghui Yang (杨清慧) 1095576027@qq.com

Xiaojun Yang yxj71429@zju.edu.cn

Biqiong Yu (俞碧琼) biqiongyu@126.com

Huifei Zhai (翟会飞) zhaihuifei0916@163.com

Jinglei Zhang alexrea@126.com

Ke Zhang nkzk1988@zju.edu.cn

Leifeng Zhang (张雷锋) 11006066@zju.edu.cn

Pan Zhang (张攀) 21236017@zju.edu.cn

Xian Zhang fffort@163.com

Zhenxing Zhang (张贞兴) zzxht3@gmail.com

Secretaries

Institution Name Email

Zhejiang UniversityJoyce Jun Chen tqc001@zju.edu.cn

Joyce Hongli Shen joyce0911438@zju.edu.cnYing Li yuanlab@zju.edu.cn

2013 Hangzhou Workshop on Quantum Matter Page 56 /65

Travel Information

Transportation

1. Travel from the Hangzhou-Xiaoshan Airport (HGH) to Qizhen Hotel

By Taxi

It costs around ￥160 from the airport to Qizhen Hotel, and takes about one hour.

By Bus and Taxi

There are regular shuttle buses (every 15-30 minutes) running between the airport and the downtown area. When arriving at the airport, one may take the bus to Wulinmen (the last stop) at the downtown area and then take a taxi to Qizhen Hotel. The taxi costs about ￥20.

2. Travel from the Hangzhou train station to Qizhen Hotel

If you take a taxi, it will cost ￥60 from the Hangzhou train station to Qizhen Hotel.

Tips

1. We will arrange pick-up for invited speakers at the Hangzhou-Xiaoshan Airport or Shanghai PVG on April 21, based on flight information.

2. The Workshop venue is at Mengminwei Building (Room 138), Zijingang Campus, Zhejiang University. All invited speakers will be accommodated at Qizhen Hotel.

3. During 4:00pm to 6:00pm, it’s hard to find a taxi, due to drivers’ handover and the rush hour.

Contact Info

Joyce Jun Chen (Secretary) Mobile: 13456853344 Email:tqc001@zju.edu.cnYing LI (Secretary) Mobile: 13958119681 Email: yuanlab@zju.edu.cnJoyce Shen (Secretary) Mobile: 13486131273 Email: joyce0911438@zju.edu.cnHuiqiu Yuan (Prof.) Mobile: 15925666127 Email: hqyuan@zju.edu.cnZhuan Xu (Prof.) Mobile: 13588186778 Email: zhuan@zju.edu.cnJianhui DAI (Prof.) Mobile: 13819101236 Email: daijh@zimp.zju.edu.cnQijin Chen (Prof.) Mobile: 13868051460 Email: qchen@zju.edu.cn

Hotel info:

Qizhen Hotel（园正·启真酒店, 余杭塘路 866 号，浙大紫金港校园内。电话：0571－88982888）Tel.: +86-571-88982888 Address: 866 Yuhangtang Road, Hangzhou (Inside Zijingang Campus, Zhejiang University)

2013 Hangzhou Workshop on Quantum Matter Page 57 /65

You may print the following messages, in case you may find them useful.

Normally, there are taxi cabs waiting in line at the taxi stand at the Hangzhou airport. In case you don't find taxi cabs waiting, then they are waiting outside to be called. you'll need to tell the airport staff over there that you need a taxi to Hangzhou downtown.

To ask the airport staff to sending in a taxi cab:

Excuse me. I need a taxi to downtown Hangzhou. Would you please send in a taxi cab for me? Thank you.

劳驾，我需要一辆出租车去杭州市区。可以帮我叫一辆进来吗？谢谢！

To the taxi driver: （To the hotel）

Please drive me to Yuanzheng Qizhen Hotel, which is inside the Zijingang Campus, Zhejiang University. Thank you! Hotel Address: 866 Yuhangtang Road, Hangzhou Tel.: +86-571-8898 2888 Workshop secretary: +86-134 5685 3344 (Joyce Jun Chen); +86-139 5811 9681 (Ying LI)

请送我去：

浙江大学紫金港校区内的园正·启真酒店。谢谢！宾馆地址：杭州市余杭塘路866号宾馆电话：88982888

会议秘书： 陈俊（13456853344） 李颖（13958119681）

In case you need to go to the conference site directly:

Please take me to International Conference Center (Mengminwei Building), on the Zijingang Campus, Zhejiang University. Thank you! Address: 866 Yuhangtang Road, Hangzhou Secretary: +86-134 5685 3344 (Joyce Jun Chen); +86-139 5811 9681 (Ying LI)

请送我去：

浙江大学紫金港校区蒙民伟楼国际会议中心。谢谢！地址：杭州市余杭塘路866号

秘书： 陈俊（13456853344） 李颖（13958119681）

Agenda of the 2013 Hangzhou Workshop on Quantum Matter

April 21 Sun April 22 Mon April 23 Tue April 24 Wed April 25 Thur

8:30 - 9:00 Opening R. Hulet G. Shlyapnikov T-L Ho

9:00 - 9:30 E. Abrahams L. Radzihovsky M. Parish G. Strinati

9:30-10:00 S. Paschen Wei Zhang Hui Zhai Han Pu

10:00-10:30 Photo & break Coffee break Coffee break Coffee break

10:30-11:00 G. Baym Qimiao Si Xin-Cheng Xie G. Aeppli

11:00-11:30 Shuai Chen M. Aronson Li Sheng Xiaoqiao Xu

11:30-12:00 C. Sa de Melo Huiqiu Yuan

12:00-14:00

Lunch break

14:00-14:30 K. Kanoda M. Foster F. Steglich

14:30-15:00 M. Brando C. Varma Xin Lu

15:00-15:30 Yi Zhou Hong Yao Chao Cao

15:30-16:00 Coffee break Coffee break Coffee break

16:00-16:30 R. Grimm Wei Yi Mingwu Lu

16:30-17:00 S. Gupta Jing Zhang Zhenhua Yu

17:00-17:30 Qijin Chen Fuchun Zhang Lu Yu, T-L Ho

Registration

Excursion

18:00-20:00 Welcome

Reception Dinner Dinner Banquet Dinner

Tutorial lectures on Friday, April 26: (Same conference room)

8:30 – 10:00 Gora Shlyapnikov

10:30 – 12:00 Matthew Foster

There will also be poster presentations outside the conference room, throughout the Workshop.