PT-Symmetric Scattering in Flow Duct Acoustics

Physical Review Letters
Yves Aurégan, Vincent Pagneux

Abstract

We show theoretically and experimentally that the propagation of an acoustic wave in an airflow duct going through a pair of diaphragms, with equivalent amounts of mean-flow-induced effective gain and loss, displays all the features of a parity-time (PT) symmetric system. Using a scattering matrix formalism, we observe, experimentally, the properties which reflect the PT symmetry of the scattering acoustical system: the existence of spontaneous symmetry breaking with symmetry-broken pairs of scattering eigenstates showing amplification and reduction, and the existence of points with unidirectional invisibility.

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Citations

Dec 30, 2017·Physical Review Letters·V AchilleosV Pagneux
Dec 18, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Xue-Si LiWei-Jiang Gong
Jun 30, 2018·Physical Review Letters·Mudi WangZhengyou Liu
Dec 7, 2019·Physical Review Letters·Xu WangYong Li
Aug 6, 2020·The Journal of the Acoustical Society of America·Yuzhen YangJun Yang
Aug 3, 2019·The Journal of the Acoustical Society of America·Qian WuGuoliang Huang
Dec 13, 2019·Advanced Materials·Samit Kumar GuptaYan-Feng Chen
Mar 27, 2021·The Journal of the Acoustical Society of America·Gaelle PoignandGuillaume Penelet

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