Exciton storage in semiconductor self-assembled quantum dots
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.
Lundstrom
T
Materials Department, University of California, Santa Barbara, CA 93106, USA.
Schoenfeld
W
Lee
H
Petroff
PM