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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1604
DTSTART:20091020T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260315T145506Z
LAST-MODIFIED:20091015T192422Z
LOCATION:5310 Chamberlin
SUMMARY:Delocalization by disorder: non-metallic transport in layered 
 metals\, R. G. Herb Condensed Matter Seminar\, Dmitrii Maslov\, Univer
 sity of Florida
DESCRIPTION:Electron transport in many layered metals exhibits a numbe
 r of  puzzling anomalies: for example\, while the temperature dependen
 ce of the in-plane resistivity is metallic\, that of the out-of-plane 
 resistivity is insulating or even non-monotonic. Also\, it is often th
 e case that the resistivity anisotropy cannot be accounted simply by m
 ass anisotropy\, which implies that disorder is strongly anisotropic a
 s well. We show that\, contrary to the widely accepted paradigm of "co
 herent-incoherent crossover"\, the Boltzmann equation is applicable to
  layered systems both for elastic and Eliashberg-type (dynamic) inelas
 tic scattering as long as the "good-metal" condition (E_Fτ) is satisf
 ied and disorder is not correlated.  Therefore\, a model containing on
 ly those sources of scattering cannot explain the experiment. We propo
 se a model of two-channel transport\, in which electrons propagate acr
 oss the layers in two ways--coherently and via phonon-assisted tunneli
 ng through random resonant centers--and show how the experiment can be
  explained within this model.   We also propose an explanation of anom
 alously large resistivity anisotropy in a model of two types of disord
 er: planar defects and isotropic impurities. We solve this model by ma
 pping it onto the exact Berezinskii's solution of 1D localization prob
 lem and show that isotropic impurities destroy localization induced by
  planar defects.
URL:https://www.physics.wisc.edu/events/?id=1604
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