Exciton Storage in Semiconductor Self-Assembled Quantum Dots

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Science  17 Dec 1999:
Vol. 286, Issue 5448, pp. 2312-2314
DOI: 10.1126/science.286.5448.2312

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Storage and retrieval of excitons were demonstrated with semiconductor self-assembled quantum dots (QDs). The optically generated excitons were dissociated and stored as separated electron-hole pairs in coupled QD pairs. A bias voltage restored the excitons, which recombined radiatively to provide a readout optical signal. The localization of the spatially separated electron-hole pair in QDs was responsible for the ultralong storage times, which were on the order of several seconds. The present limits of this optical storage medium are discussed.

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