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

@article{Klimin2019LeggettCE,
  title={Leggett collective excitations in a two-band Fermi superfluid at finite temperatures.},
  author={S. Klimin and H. Kurkjian and J. T. Tqc and Universiteit Antwerpen and Belgium and L. L. O. Physics and H. University},
  journal={arXiv: Quantum Gases},
  year={2019}
}
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. Rev. Lett. 122, 093403 (2019). The treatment is… Expand

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References

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