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

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Journal Title
Journal ISSN
Volume Title
School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2000
Major/Subject
Mcode
Degree programme
Language
en
Pages
1592-1595
Series
Physical Review B, Volume 62, Issue 3
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.
Description
Keywords
quantum dots, photoluminescence, transition energies
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Citation
Rinaldi, Ross & Antonaci, Salvatore & DeVittorio, Massimo & Cingolani, Roberto & Hohenester, Ulrich & Molinari, Elisa & Lipsanen, Harri & Tulkki, Jukka. 2000. Effects of few-particle interaction on the atomiclike levels of a single strain-induced quantum dot. Physical Review B. Volume 62, Issue 3. P. 1592-1595. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.62.1592.