A finite-thickness superconducting film can support an acoustic plasmon whose velocity scales as sqrt(d) and sqrt(Tc-T), arising from the transverse mismatch of normal and superfluid charge profiles.
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Acoustic Plasmon Resonance: Breaking the Anderson Stiffness Paradigm in Quasi-Two-Dimensional Superconducting Films
A finite-thickness superconducting film can support an acoustic plasmon whose velocity scales as sqrt(d) and sqrt(Tc-T), arising from the transverse mismatch of normal and superfluid charge profiles.