Investigation of the Spectrum of Exciton Excited States in Self-Organized InAs/AlGaAs Quantum Dots
A. Galimov, M. Rakhlin, K. Belyaev, G. Klimko, E. Evropeytsev, A. Toropov
Ioffe Institute, 26 Polytechnicheskaya Str., 194021 St. Petersburg, Russia
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We performed comparative optical spectroscopic studies of the excitonic spectrum in self-organized InAs/Al0.3Ga0.7As and InAs/GaAs quantum dots. The exciton excited states were revealed by either measuring photoluminescence spectra using different excitation pump powers or by carrying out selective resonant excitation of the quantum dot photoluminescence through the excited states. As a result, we evaluated average energies of the excitonic transitions and elucidated dominant mechanisms of exciton relaxation from the excited states to the ground one for both types of quantum dots.

DOI:10.12693/APhysPolA.136.613
PACS numbers: 73.21.La, 71.35.-y, 78.55.Cr, 72.10.Di