Optical spectroscopy of a single Al0.36In0.64As/Al0.33Ga0.67As quantum dot -: art. no. 075314

We report results of interband spectroscopy of a single Al0.36In0.64As/Al0.33Ga0.67As self-assembled quantum dot. The single dot spectroscopy has been carried out at low temperature as a function of the excitation power and magnetic field up to 8 T. The emission spectra as a function of excitation power show two distinct groups of transitions that we associate with the recombination from ground and excited quantum dot levels with a spacing of similar to 70 meV. The application of magnetic field allows us to identify the exciton emission as well as the emission from the biexciton, and charged exciton complexes with binding energies of similar to5 meV. The binding energies compare favorably with results of calculations.