Acoustic plasmons in a two-component superconducting Coulomb liquid

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Abstract
It is shown that a single well-defined acoustic plasmon exists in a two-component Coulomb Fermi liquid in which either one or both components are superconducting. In the former case, the mode is not Landau damped, if the mass ratio between the normal and superconducting component exceeds a certain minimum value. Observation of this sharp mode could provide evidence for the superconductivity of the lighter component. In the latter case, the acoustic plasmon is sharp inside the energy gap for all values of the mass ratio.

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