Nucleation of spontaneous vortices in trapped Fermi gases undergoing a BCS-BEC crossover

We study the spontaneous formation of vortices during the superfluid condensation in a trapped fermionic gas subjected to a rapid thermal quench via evaporative cooling. Our work is based on the numerical solution of the time-dependent crossover Ginzburg-Landau equation coupled to the heat diffusion...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2011-11, Vol.84 (18), Article 180501
Main Authors: Glatz, A., Roberts, H. L. L., Aranson, I. S., Levin, K.
Format: Article
Language:English
Subjects:
CONDENSATES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIFFUSION EQUATIONS
EVAPORATIVE COOLING
GASES
NUCLEATION
NUMERICAL SOLUTION
OSCILLATIONS
VORTICES
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Summary:We study the spontaneous formation of vortices during the superfluid condensation in a trapped fermionic gas subjected to a rapid thermal quench via evaporative cooling. Our work is based on the numerical solution of the time-dependent crossover Ginzburg-Landau equation coupled to the heat diffusion equation. We quantify the evolution of condensate density and vortex length as a function of a crossover phase parameter from BCS to BEC. The more interesting phenomena occur somewhat nearer to the BEC regime and should be experimentally observable; during the propagation of the cold front, the increase in condensate density leads to the formation of supercurrents toward the center of the condensate as well as possible condensate volume oscillations.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.84.180501