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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3026
DTSTART:20131212T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T212445Z
LAST-MODIFIED:20131205T194354Z
LOCATION:5310 Chamberlin
SUMMARY:Topological Kondo Insulators\, R. G. Herb Condensed Matter Sem
 inar\, Victor Galitski\, University of Maryland
DESCRIPTION:In this talk I will review recent theoretical work on a ne
 w class of topological material systems - topological Kondo insulators
 \, which appear as a result of interplay between strong correlations a
 nd spin-orbit interactions. I will start with introducing the by now s
 tandard theory of topological band insulators and explain the Fu-Kane 
 method to calculate the Z2 topological index for time-reversal-invaria
 nt band structures in three dimensions. The method will be used to sho
 w that hybridization between the conduction electrons and localized f-
 electrons in certain heavy fermion compounds gives rise to interaction
 -induced topological insulating behavior. A mean field theory of these
  Kondo topological insulators will be derived. I will also discuss rec
 ent experimental results\, which have conclusively confirmed our predi
 ctions in the Samarium hexaboride compound\, where the long-standing p
 uzzle of the residual low-temperature conductivity has been shown to o
 riginate from topological surface states. This material system represe
 nts the first true topological insulator observed experimentally with 
 low-temperature transport dominated by the surface and essentially no 
 conduction in the bulk. In conclusion\, I will mention our ongoing the
 ory work\, which focuses on very unusual non-linear transport properti
 es of Samarium hexaboride devices\, which mimic neuron-like behavior i
 n biological systems. 
URL:https://www.physics.wisc.edu/events/?id=3026
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