Fermion-mediated BCS-BEC crossover in ultracold K40 gases

M. M. Parish, B. Mihaila, B. D. Simons, P. B. Littlewood

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Studies of Feshbach resonance phenomena in fermionic alkali gases have drawn heavily on the intuition afforded by a Fermi-Bose theory which presents the Feshbach molecule as a featureless Bose particle. While this model may provide a suitable platform to explore the Li6 system, we argue that its application to K40, where the hyperfine structure is inverted, is inappropriate. Introducing a three-state Fermi model, where a spin state is shared by the open and closed channel states, we show that effects of "Pauli blocking" appear in the internal structure of the condensate wave function.

Original languageEnglish
Article number240402
JournalPhysical Review Letters
Issue number24
Publication statusPublished - 24 Jun 2005
Externally publishedYes

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