中文标题：非线性霍尔效应

Title:Nonlinear Hall Effect

报告人：卢海舟教授南方科技大学

邀请人：王健教授

报告时间和地点：3月15日周三下午14:30至15:30 致原楼1206会议室

Abstract: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 disorderscattering 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.

报告人简介:卢海舟，2002年于兰州大学获得物理学学士学位，2007年于清华大学高等研究院获得物理学博士学位。2007年开始在香港大学做博士后研究，2012年转为研究助理教授，2015年加入南方科技大学，现在为讲席教授。主要从事凝聚态物理的研究，研究兴趣是拓扑物质等新物态中的电子输运等物性，已发表了100余篇论文。入选基金委杰出青年基金，教育部知名学者特聘教授，国家一流本科课程负责人，深圳自然科学一等奖，全球华人物理与天文学会亚洲成就奖等。

（物理与光电工程学院）