Abstract
We investigate the effects of few-particle population of a single strain-induced quantum dot by optical excitation. The low-power photoluminescence spectra consist of sharp lines with energy separation of a few meV, associated to the formation of excitonic molecules in the single dot. With increasing photoexcitation intensity, the population of higher states is observed; however, we also observe a clear intensity dependence of the transition energies, inconsistent with a simple filling of exciton levels. Based on a theoretical model for interacting electron-hole pairs in the dot, we obtain good agreement with experiment and show that exciton-exciton interactions control the spectral changes as the number of pairs is increased.
Original language | English |
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Pages (from-to) | 1592-1595 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 62 |
Issue number | 3 |
DOIs | |
Publication status | Published - 15 Jul 2000 |
MoE publication type | A1 Journal article-refereed |
Keywords
- photoluminescence
- quantum dot
- stressor