Superradiance from BEC vortices: a numerical study
F. Federici, C. Cherubini, S. Succi, and M. P. Tosi
TL;DR
This paper numerically investigates superradiant scattering of sound waves from vortex excitations in Bose-Einstein condensates, revealing conditions under which significant energy extraction occurs, with potential experimental detectability.
Contribution
It demonstrates, through numerical simulations, that superradiant scattering can occur in BEC vortices at high angular speeds, highlighting a novel energy extraction mechanism.
Findings
Superradiance occurs at high vortex angular speeds.
Sound wave-packets can extract significant energy from vortices.
Potential for experimental observation in BEC systems.
Abstract
The scattering of sound wave perturbations from vortex excitations of Bose-Einstein condensates(BEC) is investigated by numerical integration of the associated Klein-Gordon equation. It is found that, at sufficiently high angular speeds, sound wave-packets can extract a sizeable fraction of the vortex energy through a mechanism of superradiant scattering. It is conjectured that this superradiant regime may be detectable in BEC experiments.
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