Quasiparticles in superfluid Fermi gases acquire a finite lifetime away from their band minimum by emitting phonons, and the paper computes the resulting changes to the gap, effective mass, and Landau critical velocity.
Collec- tive mode of homogeneous superfluid Fermi gases in the BEC-BCS crossover,
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Beyond mean-field corrections to the quasiparticle spectrum of superfluid Fermi gases
Quasiparticles in superfluid Fermi gases acquire a finite lifetime away from their band minimum by emitting phonons, and the paper computes the resulting changes to the gap, effective mass, and Landau critical velocity.