题目：Quantum Hall Effects in Transition Metal Dichalcogenides

报告人：张帆 助理教授

               德州大学达拉斯分校

时间：2018年6月29日下午14:30

地点：国家脉冲强磁场科学中心C204

报告摘要：

The family of atomically thin transition metal dichalcogenides (TMDs) is a rapidly rising star on the horizon of condensed matter physics and has already revealed a number of spin-valley-helicity coupled optical phenomena. More fascinatingly, our magnetotransport measurements have provided compelling evidence for the presence of a three-fold Q-valley degeneracy and a heavily massive G-valley in few-layer n-type and p-type TMDs, respectively. In this talk, I will discuss our recent experimental progress on quantum transport in few-layer TMDs, guided by our earlier theoretical predictions. Particularly, I will introduce that the Q valleys offer an unprecedented opportunity to realize the solid-state version of flavor SU(3) symmetry that has been rare in electron systems to date and to explore novel electromagnetic phenomena that can arise from the interplay between the emergent symmetry and electron-electron interactions. Surprisingly, electrons carry flavor-dependent electric dipole moments even at zero magnetic field, rendering a ferroelectric nematic phase, allowing electric-field manipulation of the flavors, and leading to the concept of flavortronics.

报告人简介：

Dr. Zhang has been an Assistant Professor at the University of Texas at Dallas since 2014. His research focuses primarily on topological quantum matter, many-body interactions, and 2D quantum materials. More information can be found athttps://sites.google.com/site/zhangfansetsail/publications.

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