MAGNETOLUMINESCENCE STUDIES OF INYAL1-YAS SELF-ASSEMBLED QUANTUM DOTSIN ALXGA1-XAS MATRICES

We have studied the photoluminescence spectra of InyAl1-yAs self-assem bled quantum dots in AlxGa1-xAs matrices with magnetic fields up to B = 40 T. The quantum dot structure is pseudomorphically grown by molecu lar-beam epitaxy on (100) GaAs substrates. From the analysis of the di amagnetic shift of the magnetoluminescence spectra, we estimate the to tal lateral electron and hole confinement energy to be 43 meV. The exc iton radius is deduced as 5 nm. The exciton binding energy in such a q uantum dot system is estimated to be similar to 31 meV based on trial wave-function calculations of the actual dot system.