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TACKLING FLUCTUATION CORRECTIONS IN THE BEC/BCS CROSSOVER AT NONZERO TEMPERATURES

    https://doi.org/10.1142/9789812837271_0051Cited by:0 (Source: Crossref)
    Abstract:

    The investigation of superfluid atomic Fermi gases in the regime of strong interactions is conveniently investigated with the path-integral method at temperature zero, or at the critical temperature where the gap vanishes, by taking particle-pair or hole-pair fluctuations into account. Here, we also take the particle-hole excitations into account, which is important to investigate intermediate temperatures. The additional terms in the fluctuation propagator are identified, and a contour integral representation is used to calculate the contribution of these terms to the free energy and to the density of noncondensed fermions.