Simultaneous Observation of a Topological Edge State and Exceptional Point in an Open and Non-Hermitian Acoustic System

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 syst...

Full description

Saved in:
Bibliographic Details
Published inPhysical review letters Vol. 121; no. 12; p. 124501
Main Authors Zhu, Weiwei, Fang, Xinsheng, Li, Dongting, Sun, Yong, Li, Yong, Jing, Yun, Chen, Hong
Format Journal Article
LanguageEnglish
Published United States 21.09.2018
Online AccessGet more information

Cover

More Information
Summary: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.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.121.124501