密歇根大学李璐教授报告

报告人：美国密歇根大学李璐教授
报告题目：Quantum Oscillations in Kondo Insulator SmB6 （拓扑近藤绝缘体）
时间：2016年5月13日星期五下午2点30分
地点：物理馆103室
报告摘要：
In Kondo insulator samarium hexaboride SmB6, strong correlation and band hybridization lead to a diverging resistance at low temperature. The resistance divergence ends at about 3 Kelvin, a behavior recently demonstrated to arise from the surface conductance. However, questions remain whether and where a topological surface state exists. Quantum oscillations have not been observed to map the Fermi surface. We solve the problem by resolving the Landau Level quantization and Fermi surface topology using torque magnetometry. The observed angular dependence of the Fermi surface cross section suggests two-dimensional surface states on the (101) and (100) plane. Furthermore, similar to the quantum Hall states for graphene, the tracking of the Landau Levels in the infinite magnetic field limit points to -1/2, the Berry phase contribution from the 2D Diracelectronic state.

报告人简介：李璐教授2002年本科毕业于中国科学技术大学，2008年在普林斯顿大学获得物理博士学位。2008-2011年获得Pappalardo Fellow in Physics 在美国的MIT做博士后，2011年至今在美国密歇根大学任Assistant Professor。李璐教授在强关联电子体系和拓扑绝缘体领域做出了很多杰出的工作，获得了多项Award，包括 OCPA Outstanding Young Researcher Award,
 Office of Naval Research Young Investigator Award,
 Lee Osheroff Richardson North American Science Prize, Department of Energy Early Career Award等。