Phys. Rev. A 66, 043604 (2002) [6 pages]Resonance theory of the crossover from Bardeen-Cooper-Schrieffer superfluidity to Bose-Einstein condensation in a dilute Fermi gasReceived 15 April 2002; revised 19 July 2002; published 10 October 2002 We present a description of the behavior of a superfluid gas of fermions in the presence of a Feshbach resonance over the complete range of magnetic field detunings. Starting from a resonance Hamiltonian, we exploit a functional method to describe the continuous behavior from Bardeen-Cooper-Schrieffer to Bose-Einstein condensation type superfluidity. Our results show an ability for a resonance system to exhibit a high critical temperature comparable to the Fermi temperature. The results are derived in a manner that is shown to be consistent with the underlying microscopic scattering physics. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.043604
DOI:
10.1103/PhysRevA.66.043604
PACS:
03.75.Fi, 64.60.-i, 74.20.-z
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