Abstract
A self-consistent energy functional perturbation theory is developed to evaluate the linear response of an electron gas in a cylindrical quantum well (CQW) and in a quantum well wire (QWW) to an external perturbation with arbitrary space and time dependence. Collective modes of the system are determined from the poles of the appropriate response function. Intersubband excitations with angular quantum numbers as well as intrasubband modes are investigated. In particular, the authors predict a new kind of excitation mode, referred to as the perimeter-like magnetoplasmon.
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