2023-05-18 信息来源：光电所二层报告厅
举办单位：光电研究所
负责人姓名：张靖
电话：7018917
活动主题：
many-body non-hermitian skin effect induced by a dynamic gauge coupling
形式：学术报告
活动内容摘要：
for a non-hermitian hamiltonian its spectrum and way function is sensitive to the boundary conditions. for open boundary condition all particles are cumulated at the boundary. this phenomenon is called non-hermitian skin effect (nhse). the nhse is found to have dramatic influence on the system’s band and spectral topology, as well as the spectral symmetry [62–64] and dynamics. at single-particle level the nhse has been well studied, however the many-body nhse in the presence of strong interactions is not fully understood. in this talk, i will introduce our works on an atom-cavity hybrid system where fermionic atoms in a one-dimensional lattice are subject to a cavity-induced dynamic gauge potential. the gauge coupling leads to highly-degenerate steady states in which the fermions accumulate to one edge of the lattice under an open boundary condition. such a phenomenon originates from the many-body liouvillian super-operator of the system, which, being intrinsically non-hermitian, is unstable against boundary perturbations and manifests the non-hermitian skin effect.
主讲人基本情况：
郑炜，中国科学技术大学物理学院副教授。2012年于中山大学获得博士学位。2012年至2019年先后在清华大学高等研究院、剑桥大学卡文迪许实验室、以及香港大学物理系从事博士后研究工作。2020年1月加入中国科学技术大学至今。主要研究方向是基于超冷原子平台的量子多体物理，在nature physics、physical review letters、science bulletin等学术期刊上发表论文20余篇。近年来主要学术成果包括：预言了自旋轨道耦合玻色-爱因斯坦凝聚体中的旋子结构，后被中科大实验组证实；提出驱动光晶格来模拟拓扑物态的方案，后被瑞士苏黎世工业技术学院实验组实现；发现了驱动玻色-爱因斯坦凝聚体中的非线性阻尼等。
听众范围：物理学科师生
举办时间：2023-05-19
举办地点：光电所二层报告厅
报告类型：理科类