【学术视频】Non-Hermitian Topology and Dynamics | 清华大学徐勇助理教授

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图 | 徐勇

题   目：Weyl exceptional rings and topological non-hermitian quasicrystals

报告人：徐勇

单   位：清华大学

时   间：2019-12-01

地   点：复旦大学

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报告摘要

The heralded (or post-selected) evolution of a quantum system can be mapped to the dynamics under a non-Hermitian Hamiltonian, with the long-lived state corresponding to the ground state. We show that the long-time dynamics of a non-Hermitian quantum spin system presents quantum criticality in the complex plane of the magnetic field, with the boundary of the critical regime defined by the boundary of the Lee-Yang zeros-the Yang-Lee singularities at the limit of zero temperature, which are identical as the exceptional points of the non-Hermitian Hamiltonian. This finding alludes to a deep connection between the thermal phase transitions (related to Lee-Yang zeros), the exceptional points (of non-Hermitian quantum systems), and quantum criticality.

个人简介

徐勇，清华大学交叉信息研究院助理教授。2013年获得中国科学院物理研究所物理学博士学位。先后在美国德克萨斯大学达拉斯分校做访问研究助理、研究科学家、博士后研究员。其主要研究方向包括超冷原子气体和拓扑凝聚态物理。

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

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