Superradiance from BEC vortices: a numerical study

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.

4 pages, 4 figures

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• Superradiant Amplification of Acoustic Beams via Medium Rotation
• Understanding superradiant phenomena with synthetic vector potentials in atomic Bose-Einstein condensates
• Is a doubly quantized vortex dynamically unstable in uniform superfluids?
• Bose-Einstein Condensates with Derivative and Long-Range Interactions as Set-Ups for Analog Black Holes
• Zero-point excitation of a circularly moving detector in an atomic condensate and phonon laser dynamical instabilities
• Onset of superradiant instabilities in the hydrodynamic vortex model
• Acoustic superradiance from an optical-superradiance-induced vortex in a Bose-Einstein condensate
• Spacetime analogue of Bose-Einstein condensates: Bogoliubov-de Gennes formulation
• Rotational superradiance with Bogoliubov dispersion
• Black-hole lasing in coherently coupled two-component atomic condensates
• Astrophysical Bose-Einstein Condensates and Superradiance
• Dissipative Quantum Vortices and Superradiant Scattering
• The effective geometry of the $n=1$ uniformly rotating self-gravitating polytrope
• Acoustic Superradiance from a Bose-Einstein Condensate Vortex with a Self-Consistent Background Density Profile
• Resonant frequencies of the hydrodynamic vortex
• Astrophysical Accretion as an Analogue Gravity Phenomena
• Marginally stable resonant modes of the polytropic hydrodynamic vortex
• Vortices in Bose-Einstein Condensates: Theory
• Effects of the Quantum Potential on lower dimensional models of analogue gravity