Equation of state of a superfluid Fermi gas in the BCS-BEC crossover

Details Equation of state of a superfluid Fermi gas in the BCS-BEC crossover Equation of state of a superfluid Fermi gas in the BCS-BEC crossover

2005-06-02

arxiv.org/abs/cond-mat/0506046v3

Europhys. Lett. 74, 574 (2006)

Physics

Condensed Matter

Superconductivity

7 pages, 4 figures, published version in Europhysics Letters, a long preprint with details will appear soon

Scientific paper

10.1209/epl/i2006-10023-y

We present a theory for a superfluid Fermi gas near the BCS-BEC crossover, including pairing fluctuation contributions to the free energy similar to that considered by Nozieres and Schmitt-Rink for the normal phase. In the strong coupling limit, our theory is able to recover the Bogoliubov theory of a weakly interacting Bose gas with a molecular scattering length very close to the known exact result. We compare our results with recent Quantum Monte Carlo simulations both for the ground state and at finite temperature. Excellent agreement is found for all interaction strengths where simulation results are available.

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