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浙师大物理学科云端学术直播活动 (二十六): Floquet Topological Phases of Non-Hermitian Systems (安钧鸿,兰州大学)
发布时间: 2020-06-19 浏览次数: 66

【报告题目】Floquet Topological Phases of Non-Hermitian Systems

【报告人】安钧鸿 教授,兰州大学

【报告时间】2020.07.02 下午14:00

学术活动直播地址:https://meeting.tencent.com/s/I2uWRtGa5ja2,会议ID:364 379 629

【报告摘要】 The non-Hermiticity caused breakdown of the bulk-boundary correspondence (BBC) in topological phase transition was curled by the skin effect for the systems with chiral symmetry and translation invariance. However, periodic driving, as an active tool in engineering exotic topological phases, breaks the chiral symmetry, and the inevitable disorder destroys the translation invariance. Here, we propose a scheme to retrieve the BBC and establish a complete description to the topological phases of the periodically driven non-Hermitian system both with and without the translation invariance. The demonstration of our method in the non-Hermitian Su-Schrieer-Heeger model shows that exotic non-Hermitian topological phases of widely tunable numbers of edge states and Floquet topological Anderson insulator are induced by the periodic driving and the disorder. Our result supplies a useful way to artificially synthesize exotic phases by periodic driving in the non-Hermitian system.

ReferenceHong Wu and Jun-Hong An, arXiv:2003.08055.

【邀请人】 高先龙 教授

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