Time resolved studies of intersubband relaxation in GaAs/AlGaAs quantum wells below the optical phonon energy using a free electron laser

TitleTime resolved studies of intersubband relaxation in GaAs/AlGaAs quantum wells below the optical phonon energy using a free electron laser
Publication TypeJournal Article
Year of Publication1996
AuthorsB.N Murdin, C Langerak, M. Helm, P. Kruck, W. Heiss, V. Rosskopf, G. Strasser, E. Gornik, M. Dur, S.M Goodnick, S.C Lee, I. Galbraith, C.R Pidgeon
JournalSuperlattices and Microstructures
Volume19
Number1
Pagination17-24
Date Published1996
ISBN Number0749-6036
Abstract

The problem of intersubband relaxation in GaAs/GaAs quantum wells, where the energy separation of the two lowest subbands is smaller than the optical phonon energy, is considered. Time resolved pump-and-probe measurements are performed with a far-infrared free-electron laser on two multiquantum well samples with similar thicknesses (approximate to 300 Angstrom), but different doping and mobilities. The measured lifetimes are shorter than could be explained by acoustic phonon emission alone. Monte-Carlo calculations show the importance of electron-electron scattering for thermalization of the hot electron distribution function and subsequent optical phonon emission from the long thermal tail. (C) 1996 Academic Press Limited

DOI10.1006/spmi.1996.0003
PID

605b85765f2ecdea76797cd31bb926c2

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