Cascaded exciton emission of an individual strain-induced quantum dot
Schülein, F. J. R. · Laucht, A. · Riikonen, J. · Mattila, M. · Sopanen, M. · Lipsanen, H. · Finley, J. J. · Wixforth, A. · Krenner, H. J.
Original · EN
Single strain-induced quantum dots are isolated for optical experiments by selective removal of the inducing InP islands from the sample surface. Unpolarized emission of single, bi- and triexciton transitions are identified by power-dependent photoluminescence spectroscopy. Employing time-resolved experiments performed at different excitation powers we find a pronounced shift of the rise and decay times of these different transitions as expected from cascaded emission. Good agreement is found for a rate equation model for a three step cascade.
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