Leggett collective excitations in a two-band Fermi superfluid at finite temperatures

18 Oct 2019 Klimin S. N. Kurkjian H. Tempere J.

The Leggett collective excitations for a two-band Fermi gas with s-wave pairing and Josephson interband coupling in the BCS-BEC crossover at finite temperatures are investigated within the Gaussian pair fluctuation approach. Eigenfrequencies and damping factors for Leggett modes are determined in a nonperturbative way, using the analytic continuation of the fluctuation propagator through a branch cut in the complex frequency plane, as in Phys... (read more)

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