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Generation and decay of two-dimensional quantum turbulence in a trapped Bose-Einstein condensate

Lookup NU author(s): Dr George Stagg, Dr Joy AllenORCiD, Professor Nick ParkerORCiD, Professor Carlo Barenghi

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Abstract

In a recent experiment, Kwon et. al (arXiv:1403.4658) generated a disordered state of quantum vortices by translating an oblate Bose-Einstein condensate past a laser-induced obstacle and studying the subsequent decay of vortex number. Using mean-field simulations of the Gross-Pitaevskii equation, we shed light on the various stages of the observed dynamics. We find that the flow of the superfluid past the obstacle leads initially to the formation of a classical-like wake, which later becomes disordered. Following removal of the obstacle, the vortex number decays due to vortices annihilating and reaching the boundary. Our results are in excellent agreement with the experimental observations. Furthermore, we probe thermal effects through phenomenological dissipation.

Publication metadata

Author(s): Stagg GS, Allen AJ, Parker NG, Barenghi CF

Publication type: Article

Publication status: Published

Journal: Physical Review A

Year: 2015

Volume: 91

Pages: 013612

Print publication date: 13/01/2015

Online publication date: 13/01/2015

Acceptance date: 31/12/2014

Date deposited: 22/01/2015

ISSN (print): 1050-2947

ISSN (electronic): 1094-1622

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevA.91.013612

DOI: 10.1103/PhysRevA.91.013612

Notes: Text also available at: http://arxiv.org/abs/1408.3268

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