Magnetoplasmons in an electron gas at the crossover from two- to one-dimensional behavior

Abstract

Magnetoplasmons in a strongly modulated two-dimensional electron gas are studied within the random-phase approximation, including for the first time local fields as well as screening effects in the ground state. With increasing modulation a transition from ``bulk'' to ``edge'' magnetoplasmons accompanied by a frequency lowering is observed. Our results open a new interpretation of recent far-infrared experiments and correct predictions of classical model calculations that become unphysical for submicrometer systems.