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Spin-up of a superfluid vortex lattice driven by rough boundaries

Lookup NU author(s): Nick Keepfer, Dr George Stagg, Dr Luca Galantucci, Professor Carlo Barenghi, Professor Nick ParkerORCiD

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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, 2020.

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Abstract

We study numerically the formation of a vortex lattice inside a rotating bucket containing superfluid helium, paying attention to an important feature which is practically unavoidable in all experiments: the microscopic roughness of the bucket's surface. We model this using the Gross-Pitaevskii equation for a weakly interacting Bose gas, a model which is idealized when applied to superfluid helium but captures the key physics of the vortex dynamics which we are interested in. We find that the vortex lattice arises from the interaction and reconnections of nucleated U-shaped vortex lines, which merge and align along the axis of rotation. We quantify the effects which the surface roughness and remanent vortex lines play in this process.

Publication metadata

Author(s): Keepfer NA, Stagg GW, Galantucci L, Barenghi CF, Parker NG

Publication type: Article

Publication status: Published

Journal: Physics Review B

Year: 2020

Volume: 102

Issue: 14

Print publication date: 01/10/2020

Online publication date: 21/10/2020

Acceptance date: 06/10/2020

Date deposited: 26/10/2020

ISSN (print): 2469-9950

ISSN (electronic): 2469-9969

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevB.102.144520

DOI: 10.1103/PhysRevB.102.144520

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