Lookup NU author(s): Mx Em Rickinson,
Dr Nicholas Parker,
Dr Andrew Baggaley,
Professor Carlo Barenghi
This is the authors' accepted manuscript of an article that has been published in its final definitive form by American Physical Society, 2018.
For re-use rights please refer to the publisher's terms and conditions.
We determine the evolution of a cluster of quantum vortices initially placed at the center of a larger vortex-free region. We find that the cluster spreads out spatially. This spreading motion consists of two effects: the rapid evaporation of vortex dipoles from the cluster and the slow expansion of the cluster itself. The latter is akin to a diffusion process controlled by the quantum of circulation. Numerical simulations of the Gross-Pitaevskii equation show that this phenomenon is qualitatively unaffected by the presence of sound waves, vortex annihilations, and boundaries, and it should be possible to create it in the laboratory.
Author(s): Rickinson E, Parker NG, Baggaley AW, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Physical Review A
Print publication date: 07/08/2018
Online publication date: 07/08/2018
Acceptance date: 16/07/2018
Date deposited: 07/08/2018
ISSN (print): 2469-9926
ISSN (electronic): 2469-9934
Publisher: American Physical Society
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