Abstract
Carrier activation dynamics is measured in self-assembled InAs/GaAs quantum dots with a high degree of electronic state symmetry, at room temperature and following resonant excitation in the ground state. Carriers are activated to the first excited state on a 15-ps time scale in the low-excitation regime, and the total activation rate increases quadratically with the fractional dot occupation. Electron-hole interaction is identified as the dominant mechanism of electron scattering within the lowest confined states of a single quantum dot, circumventing the observation of a phonon bottleneck.
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