In spin- and mass-imbalanced Fermi superfluids, Anderson-Bogolyubov sound modes acquire Landau damping at zero temperature once the Fermi-surface mismatch exceeds a threshold set by the mass ratio and the superfluid gap.
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Damping of the Anderson-Bogolyubov mode by spin and mass imbalance in Fermi mixtures
In spin- and mass-imbalanced Fermi superfluids, Anderson-Bogolyubov sound modes acquire Landau damping at zero temperature once the Fermi-surface mismatch exceeds a threshold set by the mass ratio and the superfluid gap.