LOW-FREQUENCY MAGNETOPLASMA EXCITATIONS IN GAAS ALGAAS QUANTUM WIRES/

Plasma resonances in the rf range have been observed in quantum-wire s tructures in a strong magnetic field near integer values of the Landau -level filling factor (nu=2 and nu=4). The frequency of these resonanc es at nu=2 is lower than that at nu=4. The Q factor decreases with inc reasing temperature and/or with increasing distance from an integer va lue of nu. The experimental results show that these resonances can be associated with excitations similar to edge magnetoplasmons in an ordi nary 2D system.