Influence of shape of quantum dots on their far-infrared absorption

Details Influence of shape of quantum dots on their far-infrared absorption Influence of shape of quantum dots on their far-infrared absorption

1999-07-15

arxiv.org/abs/cond-mat/9907216v1

Phys. Rev. B 60, 16591 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX, 16 pages with 10 postscript figures included. Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.60.16591

We investigate the effects of the shape of quantum dots on their far-infrared absorption in an external magnetic field by a model calculation. We focus our attention on dots with a parabolic confinement potential deviating from the common circular symmetry, and dots having circular doughnut shape. For a confinement where the generalized Kohn theorem does not hold we are able to interprete the results in terms of a mixture of a center-of-mass mode and collective modes reflecting an excitation of relative motion of the electrons. The calculations are performed within the time-dependent Hartree approximation and the results are compared to available experimental results.

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