Quantum Dots - Theory for Experiments
L. Jacaka, J. Krasnyjb and A. Wójsa
aInstitute of Physics, Technical University of Wrocław, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
bInstitute of Mathematics, University of Opole, Oleska 48, 45-951 Opole, Poland
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A simple model based on the effective-mass method and treating a quantum dot as a small irregularity of the periodic crystal field is developed and used for the description of the radiative recombination of an exciton captured in that quasi-zero-dimensional structure. The additional peaks appearing in the photoluminescence spectra at the critical quantum dot size are predicted as a consequence of the metastable excited states occurring in the energy spectrum of a confined exciton. The obtained dependence of the photoluminescence spectrum on the dot size and magnetic field reproduces well the available experimental results.
DOI: 10.12693/APhysPolA.92.633
PACS numbers: 73.20.Dx, 71.35.Ji, 78.20.Ls