Continuous wave- and time-resolved micro-photoluminescence spectroscopy has been performed on single InAs self-assembled quantum dots grown on GaAs. The presence of residual impurities (donors and acceptors) in samples with low dot density opens the possibility to switch from trion to neutral exciton states inside quantum dots by selective optical pumping. We propose a microstate model to describe the recombination dynamics of all the excitonic especies (neutral exciton, positive/negative trion and biexciton) under the considered optical pumping conditions when increasing the excitation power.
|Number of pages||4|
|Journal||Physica E: Low-Dimensional Systems and Nanostructures|
|Publication status||Published - Apr 2008|
- Microstate theory
- Optical switching
- Time-resolved photoluminescence
- Trion and exciton recombination