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Decay of homogeneous two-dimensional quantum turbulence

Lookup NU author(s): Dr Andrew BaggaleyORCiD, Professor Carlo Barenghi

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This is the final published version of an article that has been published in its final definitive form by American Physical Society, 2018.

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Abstract

We numerically simulate the free decay of two-dimensional quantum turbulence in a large, homogeneous Bose-Einstein condensate. The large number of vortices, the uniformity of the density profile, and the absence of boundaries (where vortices can drift out of the condensate) isolate the annihilation of vortex-antivortex pairs as the only mechanism which reduces the number of vortices, Nv, during the turbulence decay. The results clearly reveal that vortex annihilation is a four-vortex process, confirming the decay law Nv ∼ t−1/3 where t is time, which was inferred from experiments with relatively few vortices in small harmonically trapped condensates.

Publication metadata

Author(s): Baggaley AW, Barenghi CF

Publication type: Article

Publication status: Published

Journal: Physical Review A

Year: 2018

Volume: 97

Issue: 3

Print publication date: 01/03/2018

Online publication date: 01/03/2018

Acceptance date: 20/02/2018

Date deposited: 12/03/2018

ISSN (electronic): 2469-990X

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevA.97.033601

DOI: 10.1103/PhysRevA.97.033601

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