Plasma dispersion of multisubband electron systems over liquid helium

Details Plasma dispersion of multisubband electron systems over liquid helium Plasma dispersion of multisubband electron systems over liquid helium

2000-05-31

arxiv.org/abs/cond-mat/0005545v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1088/0953-8984/12/46/304

Density-density response functions are evaluated for nondegenerate multisubband electron systems in the random-phase approximation for arbitrary wave number and subband index. We consider both quasi-two-dimensional and quasi-one- dimensional systems for electrons confined to the surface of liquid helium. The dispersion relations of longitudinal intrasubband and transverse intersubband modes are calculated at low temperatures and for long wavelengths. We discuss the effects of screening and two-subband occupancy on the plasmon spectrum. The characteristic absorption edge of the intersubband modes is shifted relatively to the single-particle intersubband separation and the depolarization shift correction can be significant at high electron densities.

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