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This Week at Physics

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Event Number 3422

  Thursday, October 30th, 2014

R. G. Herb Condensed Matter Seminar
Quantum Oscillations in Kondo Insulator SmB6
Time: 10:00 am
Place: Chamberlin 5310
Speaker: Lu Li, University of Michigan
Abstract: In Kondo insulator samarium hexaboride SmB6, strong correlation and<br>
band hybridization lead to a diverging resistance at low temperature.<br>
The resistance divergence ends at about 3 Kelvin, a behavior recently<br>
demonstrated to arise from the surface conductance. However, questions<br>
remain whether and where a topological surface state exists. Quantum<br>
oscillations have not been observed to map the Fermi surface. We solve<br>
the problem by resolving the Landau Level quantization and Fermi<br>
surface topology using torque magnetometry. The observed angular<br>
dependence of the Fermi surface cross section suggests two-dimensional<br>
surface states on the (101) and (100) plane. Furthermore, similar to<br>
the quantum Hall states for graphene, the tracking of the Landau<br>
Levels in the infinite magnetic field limit points to -1/2, the Berry<br>
phase contribution from the 2D Dirac electronic state.
Host: Vavilov
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