期刊
PHYSICAL REVIEW LETTERS
卷 99, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.99.145301
关键词
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资金
- EPSRC [EP/D032407/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D032407/1] Funding Source: researchfish
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 Schrodinger 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.
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