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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3422
DTSTART:20141030T150000Z
DTEND:20141030T160000Z
DTSTAMP:20240328T181328Z
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
\nband hybridization lead to a diverging resistance
at low temperature.
\nThe resistance divergence ends at about
3 Kelvin\, a behavior recently
\ndemonstrated to arise from t
he surface conductance. However\, questions
\nremain whether a
nd where a topological surface state exists. Quantum
\noscilla
tions have not been observed to map the Fermi surface. We solve
\nthe problem by resolving the Landau Level quantization and Fermi
\nsurface topology using torque magnetometry. The observed angu
lar
\ndependence of the Fermi surface cross section suggests t
wo-dimensional
\nsurface states on the (101) and (100) plane.
Furthermore\, similar to
\nthe quantum Hall states for graphen
e\, the tracking of the Landau
\nLevels in the infinite magnet
ic field limit points to -1/2\, the Berry
\nphase contribution
from the 2D Dirac electronic state.
URL:https://www.physics.wisc.edu/events/?id=3422
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