Excited-state magnetoluminescence of InAs/GaAs self-assembled quantum dots

The magnetoluminescence of InAs/GaAs self-assembled quantum dots (QDs) is s tudied. Using different excitation intensities, the dots are tilled with up to 11-12 electron-hole pairs and the magnetic field evolution of the excit ed-state emissions is revealed. The magnetoluminescence spectra resemble ve ry well the spectra of uncorrelated electro-hole pairs. A splitting of the states with a nonzero angular momentum quantum number is observed and the i n-plane reduced electron-hole mass is determined. The experimental value is found to be in a good agreement with the theoretical predictions based on the eight-band k . p model including both strain effect and band nonparabol icity.