Josephson relation for the superfluid density in the BCS-BEC crossover

Journal Article · Tue Apr 01 00:00:00 EDT 2008 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.77.144521· OSTI ID:21143278

Taylor, Edward ^[1]

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1. CNR-INFM BEC Center and Dipartimento di Fisica, Universita di Trento, I-38050 Povo, Trento (Italy)

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 {rho}{sub s} and the broken-symmetry Cooper pair order parameter {delta}{sub 0} 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.

• OSTI ID: 21143278
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 77, Issue 14; Other Information: DOI: 10.1103/PhysRevB.77.144521; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS THEORY
BOSE-EINSTEIN CONDENSATION
CONDENSATES
COOPER PAIRS
COUPLING
DENSITY
DIMERS
FLUCTUATIONS
JOSEPHSON EFFECT
MOLECULES
ORDER PARAMETERS
SUPERFLUIDITY
SYMMETRY BREAKING