Simultaneous Observation of a Topological Edge State and Exceptional Point in an Open and Non-Hermitian Acoustic System
Simultaneous Observation of a Topological Edge State and Exceptional Point in an Open and Non-Hermitian Acoustic System
复制标题
开放非厄米声学系统中拓扑边缘态和异常点的同时观测
DOI：
10.1103/physrevlett.121.124501
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发表时间：
2018
影响因子：
8.6
通讯作者：
Hong Chen
中科院分区：
文献类型：
--
作者：
Weiwei Zhu;Xinsheng Fang;Dongting Li;Yong Sun;Yong Li;Yun Jing;Hong Chen
这封信报告的拓扑保护的边缘状态和例外点在开放和非厄米（有损）声学系统的实验观察。虽然理论基础是通用的波动物理，模拟和实验进行的声学系统。它具有非平凡的拓扑性质，只要引入一个合成维数，就可以用陈数来表征。单向无反射传播，一个特殊点的标志，是明确观察到的模拟和实验。
This Letter reports on the experimental observation of a topologically protected edge state and exceptional point in an open and non-Hermitian (lossy) acoustic system. Although the theoretical underpinning is generic to wave physics, the simulations and experiments are performed for an acoustic system. It has nontrivial topological properties that can be characterized by the Chern number provided that a synthetic dimension is introduced. Unidirectional reflectionless propagation, a hallmark of exceptional points, is unambiguously observed in both simulations and experiments.