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arxiv: cond-mat/0607045 · v2 · pith:75EZG4AW · submitted 2006-07-03 · cond-mat.stat-mech · cond-mat.supr-con

Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover

M. W. J. Romans , H. T. C. Stoof This is my paper

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classification cond-mat.stat-mech cond-mat.supr-con
keywords feshbachtheorybec-bcsbogoliubovcrossovermoleculesresonanceaccurately
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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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