Coupling of hydrodynamics and quasiparticle motion in collective modes of superfluid trapped Fermi gases

Journal Article · Tue May 15 00:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.053607· OSTI ID:20982567

Urban, Michael ^[1]

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1. Institut de Physique Nucleaire, CNRS and Universite Paris-Sud, 91406 Orsay Cedex (France)

At finite temperature, the hydrodynamic collective modes of superfluid trapped Fermi gases are coupled to the motion of the normal component, which in the BCS limit behaves like a collisionless normal Fermi gas. The coupling between the superfluid and the normal components is treated in the framework of a semiclassical transport theory for the quasiparticle-distribution function, combined with a hydrodynamic equation for the collective motion of the superfluid component. We develop a numerical test-particle method for solving these equations in the linear-response regime. As a first application we study the temperature dependence of the collective quadrupole mode of a Fermi gas in a spherical trap. The coupling between the superfluid collective motion and the quasiparticles leads to a rather strong damping of the hydrodynamic mode already at very low temperatures. At higher temperatures the spectrum has a two-peak structure, the second peak corresponding to the quadrupole mode in the normal phase.

• OSTI ID: 20982567
• Journal Information: Physical Review. A, Vol. 75, Issue 5; Other Information: DOI: 10.1103/PhysRevA.75.053607; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS THEORY
BOSE-EINSTEIN CONDENSATION
COUPLING
DISTRIBUTION FUNCTIONS
FERMI GAS
FERMIONS
HYDRODYNAMICS
QUADRUPOLES
SEMICLASSICAL APPROXIMATION
SPECTRA
SPHERICAL CONFIGURATION
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
TRANSPORT THEORY
TRAPPING
TRAPS