PHYS-2402

Mar. 24, 2015

Lecture 16

Announcement

Course webpage

http://highenergy.phys.ttu.edu/~slee/2402/

Textbook

HW5 (due 3/31)

15, 18, 24, 28, 36

Midterm Exam Grade:

Class average: ~ 54% Quiz 2 (4/9)

6.2 The Potential Barrier &

Tunneling

•  Tunneling is one of the most important & startling" ideas in QM. "

•  The simplest solution is a potential barrier, a PE " jumps that is only temporary."

•  If a particle’s E < Barrier’s height. " it should not get through - classically"

Potential Barrier

R(L)

T(L)

(!)

Resonant Transmission

Is there any “L” that would give

T = 1, R = 0

? Like i

n OPTIC

S

Resonant Transmission

Is there any “L” that would give

T = 1, R = 0

? Like i

n OPTIC

S

= 0

Resonant Transmission

T = 1, R = 0

for:

Barrier Penetration – “Tunneling”

Barrier Penetration – “Tunneling” Barrier Penetration – “Tunneling”