MAGNETOPLASMA EXCITATIONS IN ELECTRON-RINGS

Magnetoplasma excitations in two-dimensional electron rings are studie d using a hydrodynamic theory based on the Thomas-Fermi-Dirac-von Weiz sacker approximation to the electronic ground state. This system is fo und to support a rich spectrum of excitations including bulk and edge magnetoplasmons, Good agreement between theory and experiment is found with respect to the magnetic-field dispersion of the modes and their dependence on the ratio of the inner to outer ring diameters.