【学术视频】Non-Hermitian Topology and Dynamics | 香港大学沈顺清教授

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图 | 沈顺清

题   目：Quantum interference theory of magnetoresistance in topological materials - from 2D to 3D dirac fermions

报告人：沈顺清

单   位：香港大学

时   间：2019-12-01

地   点：复旦大学

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报告摘要

Topological insulator and semimetal have attracted much attention and witnessed impressive theoretical and experimental breakthroughs in the past decades. Recently, an intriguing magnetic field-driven crossover from positive to negative magnetoresistance (MR) has been widely observed in variety of topological materials, where a notch-shaped longitudinal MR appears in the vicinity of the zero magnetic field and turns into a negative MR when the magnetic field exceeds some critical value. The origin of the notch at small field is not completely understood and may arise from quantum interference effect or the Zeeman energy. The large negative longitudinal MR at higher field is commonly attributed to the chiral anomaly and regarded as a crucial transport signature for Weyl fermions but some other mechanisms are also proposed. In this talk, I will introduce a quantum interference theory for magnetoresistance in topological materials. Strong competition between weak localization and weak anti-localization is uncovered in the massive and massless Dirac particles in topological materials, in which the conduction bands and the valence bands are strongly coupled. This will be revealed through the non-monotonic behaviors of magnetoresistance in these materials.

个人简介

沈顺清，香港大学物理系教授，凝聚态物理学家。主要从事凝聚态物理和多体理论的研究，包括拓扑绝缘体、半导体自旋电子学、量子磁性、过渡金属氧化物、强关联电子体系等。编写了有关拓扑绝缘体和超导体的第一本专著--《拓扑绝缘体》。曾获香港裘槎基金会“优秀科研者奖”（Croucher Senior Research Fellowship）、香港大学杰出研究学者奖。

会议简介

会议名称：Fudan Mini-program on Non-Hermitian Topology and Dynamics

会议时间：2019年11月30日-12月1日

会议地点：上海

主办方：复旦大学

—— ——往期精彩回顾—— ——●【学术视频】凝聚态物理南方论坛2019 | 香港大学沈顺清教授：Topological Anderson Insulators: Theory and Experiments●【学术视频】Non-Hermitian Topology and Dynamics | 中科院物理研究所陈澍教授:Non-Hermitian topological effect in non-reciprocal lattices●【学术视频】Non-Hermitian Topology and Dynamics | 清华大学徐勇助理教授：Weyl exceptional rings and topological non-hermitian quasicrystals●【学术视频】Non-Hermitian Topology and Dynamics | 中国科大陈帅教授：Explore topology of quantum gases by quench dynamics●【学术视频】Non-Hermitian Topology and Dynamics | 南方科技大学陈伟强教授：Classification of topological phases in one dimensional interacting non-Hermitian systems and emergent unitarity●【学术视频】Non-Hermitian Topology and Dynamics | 北京计算科学研究中心薛鹏教授：Parity-time-symmetric quantum walks

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