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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1174
DTSTART:20081002T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T200521Z
LAST-MODIFIED:20080925T181950Z
LOCATION:5310 Chamberlin
SUMMARY:Quantum transport and its classical limit\, R. G. Herb Condens
 ed Matter Seminar\, Piet Brouwer\, Cornell University
DESCRIPTION:The interference of multiply scattered quantum mechanical 
 matter waves causes small but noticeable corrections to the electrical
  conduction of a metal at low temperatures. What is the fate of quantu
 m interference corrections in the limit that the wavelength of the ele
 ctrons becomes small in comparison to all other relevant length scales
 ? This limit is a "classical limit" similar to the transition from wav
 e optics to ray optics that occurs when the typical size of optical el
 ements becomes much larger than the wavelength of light. Surprisingly\
 , the answer is not at all trivial: Whereas the interference correctio
 n to the ensemble-averaged conductance (weak localization) disappears 
 in this classical limit\, the quantum interference contribution to the
  sample-specific conductance fluctuations survives.<br>
\n<br>
\nThe "
 classical limit" is relevant for conductors in which the electron moti
 on is ballistic and the only source of scattering is specular reflecti
 on off sample boundaries or artificial macroscopic scattering sites. I
 n this talk\, I'll outline the basic structure of a theory of quantum 
 transport in ballistic conductors\, as well as possible experimental s
 ignatures that distinguish ballistic conductors and their disordered c
 ounterparts.<br>
\n
URL:https://www.physics.wisc.edu/events/?id=1174
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