Magnetoplasmon excitations in arrays of circular and noncircular quantum dots

Details Magnetoplasmon excitations in arrays of circular and noncircular quantum dots Magnetoplasmon excitations in arrays of circular and noncircular quantum dots

1999-08-17

arxiv.org/abs/cond-mat/9908235v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

25 pages, 6 figures, typeset in RevTeX

Scientific paper

10.1103/PhysRevB.61.2107

We have investigated the magnetoplasmon excitations in arrays of circular and noncircular quantum dots within the Thomas-Fermi-Dirac-von Weizs\"acker approximation. Deviations from the ideal collective excitations of isolated parabolically confined electrons arise from local perturbations of the confining potential as well as interdot Coulomb interactions. The latter are unimportant unless the interdot separations are of the order of the size of the dots. Local perturbations such as radial anharmonicity and noncircular symmetry lead to clear signatures of the violation of the generalized Kohn theorem. In particular, the reduction of the local symmetry from SO(2) to $C_4$ results in a resonant coupling of different modes and an observable anticrossing behaviour in the power absorption spectrum. Our results are in good agreement with recent far-infrared (FIR) transmission experiments.

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