An effective gauge potential for nonreciprocal acoustics
Huazhong University of Science and Technology - Wuhan 430074, PRC
Received: 2 March 2013
Accepted: 18 March 2013
It is shown that by using temporal modulation of phase velocity inside active acoustic metamaterials, an effective gauge potential can be produced to allow nonreciprocal acoustic wave propagation. Such effective gauge potential gives rise to the counterintuitive unidirectional Doppler shift. The proposed scheme provides a new class of time-varying metamaterials for nonreciprocal acoustics, which opens more possibilities for the one-way acoustic devices.
PACS: 47.35.Bb – Gravity waves / Gravity waves – / 47.11.Kb – / Spectral methods – / 47.20.Ma – / Interfacial instabilities (e.g., Rayleigh-Taylor) –
© EPLA, 2013