Abstract
We show explicitly that the hydrodynamic density modes of a heavy fermion system in the presence of long range Coulomb interactions can be reduced to those of an effective Hamiltonian used previously. Outside the hydrodynamic regime one finds acoustic plasmon (or zero sound) excitations as well as high energy plasmons. When the Fermi level intersects more than one heavy quasiparticle band, a situation which is expected to occur in most cases, then also a low-energy optical plasmon excitation should exist. The latter can be overdamped under special conditions.
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Becker, K.W., Fulde, P. Density fluctuations in heavy fermion systems. Z. Physik B - Condensed Matter 67, 35–41 (1987). https://doi.org/10.1007/BF01307305
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DOI: https://doi.org/10.1007/BF01307305