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Two-channel models of the BEC/BCS crossover

Murray Holland, J. Wächter

Jan 1, 20121 citation

Molecular Fraction of the BEC-BCS Crossover State

Guthrie B. Partridge, Ramsey I. Kamar, Kevin E. Strecker +2 more

Bulletin of the American Physical SocietyMay 19, 20050 citations

Dressed Feshbach Molecules in the BEC-BCS Crossover

M. W. J. Romans, Henk T. C. Stoof

We present the random phase approximation (RPA) theory of the Bose-Einstein-condensation-Bardeen-Cooper-Schrieffer crossover in an atomic Fermi gas near a Feshbach resonance that includes the relevant two-body atomic physics exactly. This allows us to determine the probability for the dressed molecules in the Bose-Einstein condensate to be in the closed channel of the Feshbach resonance and to compare with the recent experiments of Partridge et al. [95, 020404 (2005)10.1103/PhysRevLett.95.020404] with , who have measured the same quantity.We present the random phase approximation (RPA) theory of the Bose-Einstein-condensation-Bardeen-Cooper-Schrieffer crossover in an atomic Fermi gas near a Feshbach resonance that includes the relevant two-body atomic physics exactly. This allows us to determine the probability for the dressed molecules in the Bose-Einstein condensate to be in the closed channel of the Feshbach resonance and to compare with the recent experiments of Partridge et al. [95, 020404 (2005)10.1103/PhysRevLett.95.020404] with , who have measured the same quantity.

arXiv:cond-mat/0506282Physical Review LettersDec 28, 200529 citations

Effects of particle-hole channel on the behavior of BCS-BEC crossover

Qijin Chen

Bulletin of the American Physical SocietyMar 23, 20110 citations

A generalized molecule approach capturing the Feshbach-induced pairing physics in the BEC–BCS crossover

Eloisa Cuestas, A. P. Majtey

Abstract By including the effect of a trap with characteristic energy given by the Fermi temperature T F in a two-body two-channel model for Feshbach resonances, we reproduce the measured binding energy of ultracold molecules in a 40 K atomic Fermi gas. We also reproduce the experimental closed-channel fraction Z across the BEC–BCS crossover and into the BCS regime of a 6 Li atomic Fermi gas. We obtain the expected behavior Z ∝ T F at unitarity, together with the recently measured proportionality constant. Our results are also in agreement with recent measurements of the Z dependency on T F on the BCS side, where a significant quantitative discrepancy between experimental data and theory’s predictions has been repeatedly reported. In order to contrast with future experiments we report the proportionality constant at unitarity between Z and T F predicted by our model for a 40 K atomic Fermi gas.Abstract By including the effect of a trap with characteristic energy given by the Fermi temperature T F in a two-body two-channel model for Feshbach resonances, we reproduce the measured binding energy of ultracold molecules in a 40 K atomic Fermi gas. We also reproduce the experimental closed-channel fraction Z across the BEC–BCS crossover and into the BCS regime of a 6 Li atomic Fermi gas. We obtain the expected behavior Z ∝ T F at unitarity, together with the recently measured proportionality constant. Our results are also in agreement with recent measurements of the Z dependency on T F on the BCS side, where a significant quantitative discrepancy between experimental data and theory’s predictions has been repeatedly reported. In order to contrast with future experiments we report the proportionality constant at unitarity between Z and T F predicted by our model for a 40 K atomic Fermi gas.

Journal of Physics Condensed MatterApr 14, 20211 citation

Universality and novel phases in the BCS-BEC crossover

W. Zwerger

Bulletin of the American Physical SocietyJun 8, 20070 citations

Number of closed-channel molecules in the BEC-BCS crossover

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