Two-fluid model for a rotating trapped Fermi gas in the BCS phase

Abstract

We investigate the dynamical properties of a superfluid gas of trapped fermionic atoms in the BCS phase. As a simple example we consider the reaction of the gas to a slow rotation of the trap. It is shown that the currents generated by the rotation can be understood within a two-fluid model similar to the one used in the theory of superconductors, but with a position dependent ratio of normal and superfluid densities. The rather general result of this paper is that already at very low temperatures, far below the critical one, an important normal-fluid component appears in the outer regions of the gas. This renders the experimental observation of superfluidity effects more difficult and indicates that reliable theoretical predictions concerning other dynamical properties, like the frequencies of collective modes, can only be made by taking into account temperature effects.

6 pages, 4 figures

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Cited by in corpus (11)

• The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
• Dynamics of a trapped Fermi gas in the BCS phase
• Pair-Breaking in Rotating Fermi Gases
• Vortex arrays in neutral trapped Fermi gases throughout the BCS-BEC crossover
• Temperature and finite-size effects in collective modes of superfluid Fermi gases
• Coupling of hydrodynamics and quasiparticle motion in collective modes of superfluid trapped Fermi gases
• Thouless-Valatin Rotational Moment of Inertia from the Linear Response Theory
• Normal mass density of a superfluid Fermi gas at unitarity
• Finite temperature vortices in a rotating Fermi gas
• Diversified vortex phase diagram for a rotating trapped two-band Fermi gas in the BCS-BEC crossover
• Vortices in Fermi gases with spin-dependent rotation potentials