Experimental Realization of Weyl Exceptional Rings in a Synthetic Three-Dimensional Non-Hermitian Phononic Crystal

Jing jing Liu, Zheng Wei Li, Ze Guo Chen, Weiyuan Tang, An Chen, Bin Liang*, Guancong Ma*, Jian Chun Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Weyl points—topological monopoles of quantized Berry flux—are predicted to spread to Weyl exceptional rings in the presence of non-Hermiticity. Here, we use a one-dimensional Aubry-Andre-Harper model to construct a Weyl semimetal in a three-dimensional parameter space comprising one reciprocal dimension and two synthetic dimensions. The inclusion of non-Hermiticity in the form of gain and loss produces a synthetic Weyl exceptional ring (SWER). The topology of the SWER is characterized by both its topological charge and non-Hermitian winding numbers. We experimentally observe the SWER and synthetic Fermi arc in a one-dimensional phononic crystal with the non-Hermiticity introduced by active acoustic components. Our findings pave the way for studying the high-dimensional non-Hermitian topological physics in acoustics.

Original languageEnglish
Article number084301
JournalPhysical Review Letters
Volume129
Issue number8
DOIs
Publication statusPublished - 19 Aug 2022

Scopus Subject Areas

  • Physics and Astronomy(all)

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