Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover

Details Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover

2006-07-03

arxiv.org/abs/cond-mat/0607045v2

Physics

Condensed Matter

Statistical Mechanics

13 pages of RevTex and 12 Figures. Submitted for publication in Physical review A

Scientific paper

10.1103/PhysRevA.74.053618

We present the Bogoliubov theory for the Bose-Einstein condensation of Feshbach molecules in a balanced Fermi mixture. Because the Bogoliubov theory includes (Gaussian) fluctuations, we can in this manner accurately incorporate both the two-body and many-body aspects of the BEC-BCS crossover that occurs near a Feshbach resonance. We apply the theory in particular to the very broad Feshbach resonance in atomic Li-6 at a magnetic field of B_0 = 834 G and find good agreement with experiments in that case. The BEC-BCS crossover for more narrow Feshbach resonances is also discussed.

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