Collective charge-density excitations of non-circular quantum dots in a magnetic field

Details Collective charge-density excitations of non-circular quantum dots in a magnetic field Collective charge-density excitations of non-circular quantum dots in a magnetic field

1999-07-13

arxiv.org/abs/cond-mat/9907186v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

18 pages, 5 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.61.2729

Recent photoabsorption measurements have revealed a rich fine structure in the collective charge-density excitation spectrum of few-electron quantum dots in the presence of magnetic fields. We have performed systematic computational studies of the far-infrared density response of quantum dots, using time-dependent density-functional theory in the linear regime and treating the dots as two-dimensional disks. It turns out that the main characteristics observed in the experiment can be understood in terms of the electronic shell structure of the quantum dots. However, new features arise if a breaking of the circular symmetry of the dots is allowed, leading to an improved description of the experimental results.

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