Recombination of many-particle states in InAs self-organized quantum dots

Strong many-body effects have been observed in the time-resolved photolumin escence spectroscopy of self-organized InAs/GaAs quantum dots. Our results show that the effects generate a considerable bandgap renormalization, bein g 28 meV at a dot occupancy of 20 electron-hole pairs for the lowest transi tion. Tt is also found that many-particle state scattering gives rise to a large homogeneous broadening of the photoluminescence peak, from which we e stimate the intradot relaxation time to be 300 B. The fast intradot relaxat ion is supported by time-resolved measurements with direct excitation.