PHOTOLUMINESCENCE OF CHARGED INAS SELF-ASSEMBLED QUANTUM DOTS

We have used capacitance and photoluminescence spectroscopy to study t he optical properties of charged InAs self-assembled quantum dots. Whe n the dots are loaded with electrons, the ground-state transition in t he photoluminescence spectra shows a redshift of about 15 meV accompan ied by a decrease in intensity and a broadening. In addition, an excit ed-state transition appears. All the observations mentioned above are attributed to many-body effects caused by charging of the quantum dots with electrons. The observed changes of the photoluminescence signal are also discussed in terms of field effects.