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

Weiwei Zhu, Xinsheng Fang, Dongting Li, Yong Sun, Yong Li, Yun Jing, Hong Chen

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number124501
JournalPhysical Review Letters
Volume121
Issue number12
DOIs
StatePublished - Sep 20 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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