BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2038
DTSTART:20110217T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T134732Z
LAST-MODIFIED:20110208T151332Z
LOCATION:5310 Chamberlin
SUMMARY:Topological Insulators With Point Group Symmetry\, R. G. Herb 
 Condensed Matter Seminar\, Andrei Bernevig\, Princeton University
DESCRIPTION:We analyze several insulators that fall outside the curren
 t classification of topological insulators. We show that the topologic
 al nature of a state is not based on whether it supports gapless edge 
 modes\, and that a new concept\, the entanglement spectrum\, is requir
 ed to classify insulators. We show that topological insulators with in
 version symmetry can support many of the interesting effects that thei
 r time reversal counterparts exhibit: theta vacuum\, E dot B effect\, 
 monopole image\, etc. At the same time they do not exhibit gapless edg
 e modes when an edge/surface is placed on the material. We also provid
 e for a gauge-invariant way to calculate topological invariants which 
 has so far been absent in the literature. Experimental consequences wi
 ll also be discussed.
URL:https://www.physics.wisc.edu/events/?id=2038
END:VEVENT
END:VCALENDAR