Fermion-mediated BCS-BEC Crossover in Ultracold Potassium-40 Gases

Details Fermion-mediated BCS-BEC Crossover in Ultracold Potassium-40 Gases Fermion-mediated BCS-BEC Crossover in Ultracold Potassium-40 Gases

2004-09-30

arxiv.org/abs/cond-mat/0409756v2

Phys.Rev.Lett. 94 (2005) 240402

Physics

Condensed Matter

Other Condensed Matter

References added, Fig.1 revised, and Fig.3 removed

Scientific paper

10.1103/PhysRevLett.94.240402

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 lithium-6 system, we argue that its application to potassium-40, 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'' are recorded in the internal structure of the condensate wave function.

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