Optical spectroscopy of a single ${\mathrm{Al}}_{0.36}{\mathrm{In}}_{0.64}{\mathrm{A}\mathrm{s}/\mathrm{A}\mathrm{l}}_{0.33}{\mathrm{Ga}}_{0.67}\mathrm{As}$ quantum dot

We report results of interband spectroscopy of a single ${\mathrm{Al}}_{0.36}{\mathrm{In}}_{0.64}{\mathrm{A}\mathrm{s}/\mathrm{A}\mathrm{l}}_{0.33}{\mathrm{Ga}}_{0.67}\mathrm{As}$ 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 ∼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 ∼5 meV. The binding energies compare favorably with results of calculations.