Normal mass density of a superfluid Fermi gas at unitarity

Abstract

We calculate the normal mass density of a paired Fermi gas at unitarity. The dominant contribution near the superfluid transition is from fermionic quasiparticle excitations, and is thus sensitive to the pairing gap. A comparison with the recent experiment of Sidorenkov et al. suggests that the superfluid gap near the transition temperature is larger than the BCS value, but the data do not permit a quantitative inference of the gap. Calculations of the quenched moment of inertia of a BCS superfluid in a harmonic trap are in reasonable agreement with the earlier experiment of Riedl et al.

6 pages, 2 figures, published version

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• Second sound with ultracold atoms: A brief historical account
• First and second sound of a unitary Fermi gas in highly oblate harmonic traps
• Two-fluid theory for superfluid system with anisotropic effective masses
• Superfluid density reduction and spin-imbalanced pairing in a fermionic superfluid due to dynamical boson exchange
• Dissipative superfluid hydrodynamics for the unitary Fermi gas
• First and second sound of a unitary Fermi gas in highly elongated harmonic traps
• Probing the critical exponent of superfluid fraction in a strongly interacting Fermi gas