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Diffusion of quantum vortices

Lookup NU author(s): Mx Em Rickinson, Professor Nick ParkerORCiD, Dr Andrew BaggaleyORCiD, Professor Carlo Barenghi

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

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Abstract

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.

Publication metadata

Author(s): Rickinson E, Parker NG, Baggaley AW, Barenghi CF

Publication type: Article

Publication status: Published

Journal: Physical Review A

Year: 2018

Volume: 98

Issue: 2

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

URL: https://doi.org/10.1103/PhysRevA.98.023608

DOI: 10.1103/PhysRevA.98.023608

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