MAGNETOPLASMONS OF A 2-DIMENSIONAL ELECTRON-GAS WITH EQUILIBRIUM DENSITY INHOMOGENEITIES

Interedge magnetoplasmons are a class of magnetoplasmons localized at the boundary defined by two bidimensional metallic domains with differ ent equilibrium densities. They reduce to the usual edge magnetoplasmo ns when one of the equilibrium densities is exactly zero. The applicat ion of a hydrodynamical theory to a disk-shaped electron fluid with a central inhomogeneity reveals the existence of both edge and interedge magnetoplasmons in the high magnetic field regime, whose frequency de creases with magnetic field. if the equilibrium density of the central inhomogeneity is greater than the equilibrium density of the ring are a that surrounds it, both magnetoplasmons have the same symmetry and a nticross Strongly. In the low-field regime, the interedge magnetoplasm on exhibits a cyclotron resonance like dependence on the magnetic fiel d. The calculations are in qualitative agreement with recent experimen ts performed in the extremely high-field regime and suggest new experi ments at lower fields and/or different systems.