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Article Dans Une Revue Physical Review Letters Année : 2017

P T -Symmetric Scattering in Flow Duct Acoustics

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Résumé

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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Dates et versions

hal-01937214 , version 1 (04-12-2018)

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Yves Aurégan, Vincent Pagneux. P T -Symmetric Scattering in Flow Duct Acoustics. Physical Review Letters, 2017, 118 (17), pp.174301. ⟨10.1103/physrevlett.118.174301⟩. ⟨hal-01937214⟩
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