Lookup NU author(s): Dr Andrew Baggaley,
Professor Carlo Barenghi
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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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.
Author(s): Baggaley AW, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Physical Review A
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
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