Josephson relation for the superfluid density in the BCS-BEC crossover
Edward Taylor
DOI 10.1103/PhysRevB.77.144521 · Physical Review B
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Abstract
The Josephson relation for the superfluid density is derived for a Fermi superfluid in the BCS-BEC crossover. This identity extends the original Josephson relation for Bose superfluids. It gives a simple exact relation between the superfluid density ρs and the broken-symmetry Cooper pair order parameter Δ0 in terms of the infrared limit of the pair fluctuation propagator. The same expression holds through the entire BCS-BEC crossover, describing the superfluid density of a weak-coupling BCS superfluid as well as the superfluid density of a Bose condensate of dimer molecules.
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