Condensate fraction of a Fermi gas in the BCS-BEC crossover

Journal Article · Mon Aug 15 00:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.72.023621· OSTI ID:20718199

Salasnich, Luca; Manini, Nicola; Parola, Alberto ^[1]

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1. Dipartimento di Fisica and INFM, Universita di Milano, Via Celoria 16, 20133 Milan (Italy)

We investigate the Bose-Einstein condensation of fermionic pairs in a uniform two-component Fermi gas, obtaining an explicit formula for the condensate density as a function of the chemical potential and the energy gap. We analyze the condensate fraction in the crossover from the Bardeen-Cooper-Schrieffer (BCS) state of weakly interacting Cooper pairs to the Bose-Einstein condensate of molecular dimers. By using the local-density approximation we study confined Fermi vapors of alkali-metal atoms for which there is experimental evidence of condensation also on the BCS side of the Feshbach resonance. Our theoretical results are in agreement with these experimental data and give the behavior of the condensate on both sides of the Feshbach resonance at zero temperature.

• OSTI ID: 20718199
• Journal Information: Physical Review. A, Vol. 72, Issue 2; Other Information: DOI: 10.1103/PhysRevA.72.023621; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ATOMS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
COOPER PAIRS
DENSITY FUNCTIONAL METHOD
DIMERS
ENERGY GAP
FERMI GAS
FERMIONS
POTENTIAL ENERGY
POTENTIALS
RESONANCE
VAPORS