1. Inter-Island Energy Transfer in AlGaAs/GaAs Quantum Wells Grown by Molecular Beam Epitaxy
- Author
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P. O. Holz, Bo Monemar, Marek Godlewski, J. P. Bergman, K. Regiński, and Maciej Bugajski
- Subjects
Photoluminescence ,Materials science ,Exciton ,Energy transfer ,Kinetics ,General Physics and Astronomy ,Photoluminescence excitation ,Transition rate matrix ,Molecular physics ,Quantum well ,Molecular beam epitaxy - Abstract
The results of photoluminescence, time-resolved photoluminescence, photoluminescence excitation and photoluminescence kinetics studies are presented for a Al0.3 Ga0.7Αs/GaΑs quantum well system grown without growth interruptions at the interfaces. The time-resolved photoluminescence measurements show drift of excitons towards lower energy states induced in a quantum well by potential fluctuations. We present also a first direct evidence for migration of free excitons from the 24 to 25 ML regions of the quantum well and interpret these results within a linear rate model, deriving the transition rate of 290 ps-1. Such inter-island migration processes have been observed till now only in growth interrupted structures. PACS numbers: 78.66.Fd, 78.47.+ρ, 73.20.Jc
- Published
- 1996
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