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Dissipative dynamics of superfluid vortices at non-zero temperatures

Lookup NU author(s): Dr Anthony Youd

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Abstract

We consider the evolution and dissipation of vortex rings in a condensate at nonzero temperatures in the context of the classical field approximation, based on the defocusing nonlinear Schrödinger equation. The temperature in such a system is fully determined by the total number density and the number density of the condensate. The collisions with noncondensed particles reduce the radius of a vortex ring until it completely disappears. We obtain a universal decay law for a vortex line length and relate it to mutual friction coefficients in the fundamental equation of vortex motion in superfluids.

Publication metadata

Author(s): Berloff NG, Youd AJ

Publication type: Article

Publication status: Published

Journal: Physical Review Letters

Year: 2007

Volume: 99

Issue: 14

ISSN (print): 0031-9007

ISSN (electronic): 1079-7114

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevLett.99.145301

DOI: 10.1103/PhysRevLett.99.145301

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