Phys. Rev. A 69, 063610 (2004) [4 pages]

Nature of superfluidity in ultracold Fermi gases near Feshbach resonances

Abstract

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Jelena Stajic¹, J. N. Milstein², Qijin Chen³, M. L. Chiofalo⁴, M. J. Holland², and K. Levin¹
¹James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
²JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309, USA
³Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
⁴Classe di Scienze and INFM, Scuola Normale Superiore, Piazza dei Cavelieri 7, I-56126 Pisa, Italy

Received 18 February 2004; published 17 June 2004

We study the superfluid state of atomic Fermi gases using a BCS-Bose-Einstein-condensation crossover theory. Our approach emphasizes noncondensed fermion pairs which strongly hybridize with their (Feshbach-induced) molecular boson counterparts. These pairs lead to pseudogap effects above T_c and non-BCS characteristics below. We discuss how these effects influence the experimental signatures of superfluidity.

URL:

http://link.aps.org/doi/10.1103/PhysRevA.69.063610

DOI:

10.1103/PhysRevA.69.063610

PACS:

03.75.−b, 64.60.−i, 74.20.−z

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Phys. Rev. A 69, 063610 (2004) [4 pages]

Nature of superfluidity in ultracold Fermi gases near Feshbach resonances