Vortex-Loop Phase Transitions in Liquid Helium, Cosmic Strings, and High- T c Superconductors
1999; American Physical Society; Volume: 82; Issue: 6 Linguagem: Inglês
10.1103/physrevlett.82.1201
ISSN1092-0145
Autores Tópico(s)Cold Atom Physics and Bose-Einstein Condensates
ResumoThe distribution of thermally excited vortex loops near a superfluid phase transition is calculated from a renormalized theory. The number density of loops with a given perimeter is found to change from an exponential decay with increasing perimeter to an algebraic decay as ${T}_{c}$ is approached, in agreement with recent simulations of both cosmic strings and high- ${T}_{c}$ superconductors. Predictions of the value of the exponent of the algebraic decay at ${T}_{c}$ and of the critical behavior in the vortex density are confirmed by the simulations, giving strong support to the vortex-folding model proposed by Shenoy.
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