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- Title
Exciton–exciton collisions and conversion of interwell excitons in GaAs/AlGaAs superlattices.
- Authors
Filin, A. I.; Timofeev, V. B.; Gubarev, S. I.; Birkedal, D.; Hvam, J. M.
- Abstract
The ratio of the densities of intra- and interwell excitons in a symmetric system of coupled quantum wells — a superlattice based on a GaAs/AlGaAs heterostructure — is investigated over a wide range of optical excitation power densities. Conversion of interwell excitons into intrawell excitons as a result of exciton–exciton collisions is observed at high exciton densities. Direct evidence for such a conversion mechanism is the square-root dependence of the interwell exciton density on the optical excitation level. The decrease in the lifetime of interwell excitons with increasing excitation density, as measured directly by time-resolved spectroscopy methods, confirms the explanation proposed for the effect. © 1997 American Institute of Physics.
- Subjects
QUANTUM wells; HETEROSTRUCTURES; GALLIUM arsenide semiconductors; SUPERLATTICES; EXCITON theory
- Publication
JETP Letters, 1997, Vol 65, Issue 8, p656
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.567402