Single InxGa1-xAs/GaAs quantum dot photoluminescence spectra, obtained by low-temperature near-field scanning optical microscopy, are compared with theoretically derived optical spectra. The spectra show shell filling as well as few-particle fine structure associated with neutral and charged multiexcitons, in good agreement with the many-body calculations. There appears to be a greater tendency to charged-exciton formation, which is discussed in terms of the high diffusivity of photogenerated electrons.
Dominance of Charged Excitons in Single Quantum Dot Photoluminescence Spectra / M., Lomascolo; A., Vergine; T. K., Johal; R., Rinaldi; A., Passaseo; R., Cingolani; S., Patanè; M., Lombardi; M., Allegroni; Troiani, Filippo; Molinari, Elisa. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 66:(2002), pp. 041302-041302. [10.1103/PhysRevB.66.041302]