Effects of a few-particle interaction on the atomiclike levels of a single strain-induced quantum dot

R. Rinaldi, S. Antonaci, M. De Vittorio, R. Cingolani, U. Hohenester, E. Molinari, H. Lipsanen, J. Tulkki

Research output: Contribution to journalArticleScientificpeer-review

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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 languageEnglish
Pages (from-to)1592-1595
Number of pages4
JournalPhysical Review B
Volume62
Issue number3
DOIs
Publication statusPublished - 15 Jul 2000
MoE publication typeA1 Journal article-refereed

Keywords

  • photoluminescence
  • quantum dot
  • stressor

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