Many-Exciton Complexes in Self-Assembled Quantum Dots
A. Wójsa, P. Hawrylakb and L. Jacaka
aInstitute of Physics, Technical University of Wrocław, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
bInstitute for Microstructural Sciences, National Research Council of Canada, Ottawa, K1A 0R6, Canada
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The system of interacting electrons and holes confined in a lens-shaped InGaAs self-assembled dot is studied using exact diagonalization techniques. The single-particle energy spectrum of self-assembled dot is well approximated by that of a quasi-two-dimensional atom with parabolic lateral confinement. The electronic shell structure of self-assembled dot is responsible for a remarkable dependence of the absorption/emission spectrum on the number of excitons. This is explained in terms of hidden symmetries leading to a formation of coherent many-exciton states of weakly interacting excitons and bi-excitons.
DOI: 10.12693/APhysPolA.90.1108
PACS numbers: 73.20.Dx, 71.45.Gm, 78.66.Fd