Acoustic radiation from vortex-barrier interaction in atomic Bose-Einstein condensate

Abstract

We examine the dynamics of a vortex dipole in the Bose-Einstein condensates (BECs) of trapped dilute atomic gases at zero temperature in the presence of a Gaussian barrier potential. The density-anisotropy induced by the barrier enhances the acoustic radiation from the vortex dipole. This is due to the deviation of the condensate density from the equipotential curves and variation in the curvature of the vortex dipole trajectory. Due to the acoustic radiation, the vortex dipole dissipates energy and spirals towards the edge of the condensate. As a result, we observe an increase in the vortex-antivortex annihilation events. To examine the effect of the Gaussian barrier, we estimate the correction to the Thomas-Fermi condensate density using perturbation expansion method and the results are in very good agreement with the numerical results.

10 pages, 7 figures, extensive modification in the text and figures

References in corpus (5)

• Emergence of turbulence in an oscillating Bose-Einstein condensate
• Quantum Turbulence in a Trapped Bose-Einstein Condensate
• A vortex dipole in a trapped two-dimensional Bose-Einstein condensate
• Stability and dynamics of vortex clusters in nonrotated Bose-Einstein condensates
• Finite temperature dynamics of vortices in Bose-Einstein condensates

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• The Peripheral Vortex Biome of Confined Quantum Fluids and Its Influence on Vortex Pair Annihilation
• Coherent and dissipative transport in a Josephson junction between fermionic superfluids of ${}^6$Li atoms
• A topological realization of spin polarization through vortex formation in collisions of Bose-Einstein condensates