Superradiant Amplification of Acoustic Beams via Medium Rotation
arXiv:1809.03489 · doi:10.1103/PhysRevLett.123.044301
Abstract
Superradiant gain is the process in which waves are amplified via their interaction with a rotating body, examples including evaporation of a spinning black hole and electromagnetic emission from a rotating metal sphere. In this paper we elucidate theoretically how superradiance may be realized in the field of acoustics, and predict the possibility of non-reciprocally amplifying or absorbing acoustic beams carrying orbital angular momentum by propagating them through an absorbing medium that is rotating. We discuss a possible geometry for realizing the superradiant amplification process using existing technology.
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- Estimate of the superradiance spectrum in dispersive media
- Stable-to-unstable transition in quantum friction
- Reduced quantum electrodynamics in curved space
- Underwater Acoustic Multiplexing Communication by Pentamode Metasurface