InterlayerΓ-Xscattering in staggered-alignmentAs-AlAs ternary alloy multiple-quantum-well structures
- 15 October 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 40 (12) , 8581-8584
- https://doi.org/10.1103/physrevb.40.8581
Abstract
The interlayer Γ-X scattering rate of photoexcited electrons was measured in staggered-alignment Al0.34Ga0.66As-AlAs ternary alloy multiple-quantum-well structures. The scattering process was directly probed by femtosecond pump-and-probe spectroscopy. The mean Γ-X scattering time of electrons across the interface between Al0.34Ga0.66As layers and AlAs layers at 4.2 K is determined to be 1.2 ps, which is longer than that observed recently in GaAs-AlAs short-period superlattices and is 20 times longer than that observed in bulk GaAs at 295 K. The slowing mechanism is ascribed to the small penetration of the evanescent Γ electrons into the AlAs barrier layersKeywords
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