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BEC-BCS crossover in a Bose gas | | Arnaud Koetsier
; P. Massignan
; R. A. Duine
; H. T. C. Stoof
; | | Date: |
1 Oct 2008 | | Abstract: | We calculate the critical temperature for pair condensation in a gas of
bosonic atoms across a Feshbach resonance. Using the Nozieres-Schmitt-Rink
formalism, we show how medium effects at negative scattering lengths give rise
to pairs which are reminiscent of the ones responsible for fermionic
superfluidity. Furthermore, we find that these preformed pairs lead to a strong
suppression of the critical temperature for superfluidity. We also find that
the compressibility of the gas in its normal phase is positive, and therefore
confirm its mechanical stability throughout the entire crossover region.
Finally, we discuss prospects of observing this crossover in a gas of ultracold
133Cs atoms where recent measurements indicate that this bosonic gas may be
sufficiently long-lived to explore the crossover experimentally. | | Source: | arXiv, 0809.4189 | | Services: | Forum | Review | PDF | Favorites | |
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