Synthetic exceptional points and unidirectional zero reflection in non-Hermitian acoustic systems

Chen Shen, Junfei Li, Xiuyuan Peng, Steven A. Cummer

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Exceptional points (EPs) are responsible for a number of interesting phenomena in non-Hermitian wave systems. Here we show, both theoretically and experimentally, that EPs can be synthesized in non-Hermitian acoustic systems with unbalanced loss factors in different sections. Numerical simulations and measurements confirm that unidirectional zero reflection, one of the hallmarks of EPs, can be realized in such a compact system with controlled Willis coupling and loss. When approached from one direction in the parameter space, the material slab mimics a conventional parity-time (PT) symmetric system. Our findings provide an efficient way for advanced engineering of scattering properties of artificial acoustic materials with EP-related physics.

Original languageEnglish (US)
Article number125203
JournalPhysical Review Materials
Volume2
Issue number12
DOIs
StatePublished - Dec 17 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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