R. G. Herb Condensed Matter Seminars |
Events During the Week of October 26th through November 2nd, 2014
Monday, October 27th, 2014
- No events scheduled
Tuesday, October 28th, 2014
- No events scheduled
Wednesday, October 29th, 2014
- No events scheduled
Thursday, October 30th, 2014
- Quantum Oscillations in Kondo Insulator SmB6
- Time: 10:00 am - 11:00 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
Friday, October 31st, 2014
- No events scheduled