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Science 17 December 1999:
Vol. 286. no. 5448, pp. 2312 - 2314
DOI: 10.1126/science.286.5448.2312
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Reports

Exciton Storage in Semiconductor Self-Assembled Quantum Dots

T. Lundstrom, W. Schoenfeld, H. Lee, P. M. Petroff *

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.

Materials Department, University of California, Santa Barbara, CA 93106, USA.
*   To whom correspondence should be addressed. E-mail: petroff{at}engineering.ucsb.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Science. ISSN 0036-8075 (print), 1095-9203 (online)