报告时间：2019年7月29日上午9:30
报告地点：近代物理系108会议室
报告题目：Floquet topological phases in non-Hermitian lattices
报告人：周龙文 中国海洋大学 副教授
报告摘要：Topological states of matter in non-Hermitian systems have attracted a lot of attention due to their intriguing dynamical and transport properties. In this paper, we propose a periodically driven non-Hermitian lattice model in one dimension, which features rich Floquet topological phases. The topological phase diagram of the model is derived analytically. Each of its non-Hermitian Floquet topological phases is characterized by a pair of integer winding numbers, counting the number of real zero- and π-quasienergy edge states at the boundaries of the lattice. Non-Hermiticity-induced Floquet topological phases with unlimited winding numbers are found, which allow arbitrarily many real zero- and π-quasienergy edge states to appear in the complex quasienergy bulk gaps
in a well-controlled manner. We further suggest probing the topological winding numbers of the system by dynamically imaging the stroboscopic spin textures of its bulk states.
报告人简介：周龙文，中国海洋大学物理系副教授，主要研究方向为量子动力学中的新奇物态于现象。2011年毕业于四川大学物理系，获学士学位；2015年于新加坡国立大学物理系，获博士学位；随后在新加坡国立大学从事博士后研究，2018年加入中国海洋大学。
