Self-consistent model of magnetoplasmons in quantum dots with nearly parabolic confinement potentials

We investigate the longitudinal collective oscillations of a two-dimensional interacting electron gas (2DEG) confined to a disk (quantum dot) in a perpendicular constant magnetic field. We show how the exact results known for a parabolically confined 2DEG change when the confining potential and the electron number are varied. Considering reasonable corrections to a parabolic confinement potential, we are able to explain all features of the far-infrared spectrum of quantum dots observed in recent experiments.