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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3422
DTSTART:20141030T150000Z
DTEND:20141030T160000Z
DTSTAMP:20260419T161827Z
LAST-MODIFIED:20141028T192509Z
LOCATION:Chamberlin 5310
SUMMARY:Quantum Oscillations in Kondo Insulator SmB6\, R. G. Herb Cond
 ensed Matter Seminar\, Lu Li\, University of Michigan
DESCRIPTION:In Kondo insulator samarium hexaboride SmB6\, strong corre
 lation and<br><br>
\nband hybridization lead to a diverging resistance
  at low temperature.<br><br>
\nThe resistance divergence ends at about
  3 Kelvin\, a behavior recently<br><br>
\ndemonstrated to arise from t
 he surface conductance. However\, questions<br><br>
\nremain whether a
 nd where a topological surface state exists. Quantum<br><br>
\noscilla
 tions have not been observed to map the Fermi surface. We solve<br><br
 >
\nthe problem by resolving the Landau Level quantization and Fermi<b
 r><br>
\nsurface topology using torque magnetometry. The observed angu
 lar<br><br>
\ndependence of the Fermi surface cross section suggests t
 wo-dimensional<br><br>
\nsurface states on the (101) and (100) plane. 
 Furthermore\, similar to<br><br>
\nthe quantum Hall states for graphen
 e\, the tracking of the Landau<br><br>
\nLevels in the infinite magnet
 ic field limit points to -1/2\, the Berry<br><br>
\nphase contribution
  from the 2D Dirac electronic state.
URL:https://www.physics.wisc.edu/events/?id=3422
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