Abstract
We report on optical studies of relaxation processes in self-organized InAs/GaAs quantum dots (QDs). Photoluminescence excitation spectra reveal a series of almost equidistant lines. Their energy with respect to the detection energy does not depend on QD size. The energy separations are close to the LO phonon energy of 32.1 meV estimated numerically for strained pyramid-like InAs QDs. Carrier relaxation is found to proceed by multiphonon processes involving QD and wetting layer LO phonons, and an interface mode.
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