【大学频道】北京大学量子材料科学中心呈献 | 南方科技大学卢海舟教授

图 |  卢海舟教授

题   目：Nonlinear Hall effect

报告人：卢海舟

单   位：南方科技大学

时   间：2019-03-27

地   点：北京大学

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报告摘要

Unconventional responses upon breaking discrete or crystal symmetries open avenues for exploring emergent physical systems and materials. By breaking inversion symmetry, a nonlinear Hall signal can be observed, even in the presence of time-reversal symmetry, quite different from the conventional Hall effects. However, less is known when a strong nonlinear Hall signal can be measured, in particular, its connections with the band-structure properties. By using model analysis, we find prominent nonlinear Hall signals near tilted band anticrossings and band inversions. These band signatures can be used to explain the strong nonlinear Hall effect in the recent experiments on two-dimensional WTe2. Disorder plays indispensable roles in various linear Hall effects. We derive the formulas of the nonlinear Hall conductivity in the presence of disorder scattering and construct the general scaling law of the nonlinear Hall effect, which may help in experiments to distinguish disorder-induced contributions to the nonlinear Hall effect.

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个人简介

Hai-Zhou Lu obtained his Ph.D. in Physics from Institute for Advanced Study, Tsinghua University, Beijing, in 2007. From 2007 to 2015, he was a Postdoc and then Research Assistant Professor at the University of Hong Kong. He is now a Professor of physics at Southern University of Science and Technology, Shenzhen. His research is on the quantum transport in topological states of matter. He has published over 70 articles in physics journals, including 14 PRL, 1 Nature Physics, 5 Nature Commun., 2 Nature, with a citation over 3000 and h-index of 28.

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