@article {Hartmann2000283, title = {Optical spectra of single quantum dots: Influence of impurities and few-particle effects}, journal = {Physica Status Solidi (A) Applied Research}, volume = {178}, number = {1}, year = {2000}, note = {cited By 10}, pages = {283-290}, abstract = {The evolution of photoluminescence (PL) spectra of single GaAs/AlGaAs quantum dots (QD) is studied as a function of laser excitation power and temperature. At very low powers, where multi-exciton occupation of the QD can be excluded, an unexpected and pronounced spectral evolution is observed (large energy shifts and appearance of multiple emission lines). A similar evolution is observed at low excitation powers with increasing temperature. A model, taking into account the influence of the shallow, residual impurities in the environment of each QD, explains the observed spectral evolutions in terms of photo-depletion of the QD and hopping of impurity-bound carriers back into the QD. Theoretical calculations of the PL due to Nelectrons + 1 hole (Ne + 1h) QD states allow us to attribute the ≈︂2 meV spaced lines in the experimental spectra to the different charge states Ne + 1h, (N {\textemdash} 1) e + 1h, {\textellipsis} of the QD.}, doi = {10.1002/1521-396X(200003)178:1<283::AID-PSSA283>3.0.CO;2-M}, url = {https://onlinelibrary.wiley.com/doi/10.1002/1521-396X(200003)178:1\%3C283::AID-PSSA283\%3E3.0.CO;2-M}, author = {Hartmann, A. and Ducommun, Y. and Kapon, E. and Hohenester, U. and Simserides, C. and Molinari, E.} }