Magnetoluminescence of highly excited InAs/GaAs self-assembled quantum dots

Wr present magnetoluminescence measurements of InAs/GaAs self-assembled qua ntum dots (QD's) at different excitation intensities. By applying high exci tation intensities, the magnetic field evolution of the excited-state emiss ion of QD's is revealed. A splitting of the states with a nonzero magnetic momentum is observed and the in-plane reduced electron-hole mass is determi ned. The experimental value is found to be in a good agreement with the the oretical predictions based on the eight-band k.p model including both strai n effect and band nonparabolicity. The density dependence of the diamagneti c shift of the ground-state emission is also studied providing evidence for screening of the Coulomb interaction in QD's.