MAGNETOPLASMA EXCITATIONS IN PARABOLIC QUANTUM-WELLS - HYDRODYNAMIC MODEL

We employ a classical hydrodynamic model to study the magnetoplasma excitations of a slab of electron fluid confined in one direction by a parabolic potential, in a tilted magnetic field. The electron gas is treated as a classical charge fluid with an internal pressure p infinity (n - n(e)), when n is the number density of electrons and n(c) is a density at which the pressure vanishes. Linearizing the dynamical equations and neglecting retardation effects, we calculate the dispersion of the magnetoplasmon frequencies as a function of the in-plane wave vector q. We study the dependence of this dispersion on the strength and tilt angle of the applied magnetic field and on the parameter n(c), and show that the q = 0 frequencies that we calculate help in understanding optical experiments on imperfect parabolic wells.