Local absorption spectra of artificial atoms and molecules

Details Local absorption spectra of artificial atoms and molecules Local absorption spectra of artificial atoms and molecules

2000-08-08

arxiv.org/abs/cond-mat/0008120v1

PRB v62, 13 657 (2000)

Physics

Condensed Matter

Materials Science

To appear in Phys. Rev. B. Figures (two in colors) embedded

Scientific paper

10.1103/PhysRevB.62.13657

We investigate theoretically the spatial dependence of the linear absorption spectra of single and coupled semiconductor quantum dots, where the strong three-dimensional quantum confinement leads to an overall enhancement of Coulomb interaction and, in turn, to a pronounced renormalization of the excitonic properties. We show that -because of such Coulomb correlations and the spatial interference of the exciton wavefunctions- unexpected spectral features appear whose intensity depends on spatial resolution in a highly non-monotonic way when the spatial resolution is comparable with the excitonic Bohr radius. We finally discuss how the optical near-field properties of double quantum dots are affected by their coupling.

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