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Opt Express. 2012 Aug 27;20(18):19850-8. doi: 10.1364/OE.20.019850.

Imbalanced initial populations between dark and bright states in semiconductor quantum dots.

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Department of Electronics Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan.


We present the observation and analysis of long-lived exciton in individual InAs quantum dots (QDs). The general model considering the interplay between dark and bright states reveals the two key factors responsible for the long decay time: the shortened spin-flip time at elevated temperature and the imbalanced initial populations between the dark and bright states. The later one plays a key role in the unusual phenomena and leads to the possibility of spin-dependent relaxation process in QDs.

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