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Nonlocal dispersion of edge magnetoplasma excitations in a two-dimensional electron system.

Edge magnetoplasma excitations in a two-dimensional electron system have been studied in radio-frequency experiments which exhibit a strong nonlocal behavior of the plasmon dispersion. The nonlocality is shown to be caused by the diagonal conductivity σ xx , which, via a length l ∞ σ xx , governs the spatial distribution of the plasma charge oscillations in the direction perpendicular to the plasmon wave vector, i.e., to the edge of the two-dimensional layer