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

B. N. Murdin, C. J G M Langerak, M. Helm, P. Kruck, W. Heiss, V. Rosskopf, G. Strasser, E. Gornik, M. Dür, S. M. Goodnick, S. C. Lee, I. Galbraith, C. R. Pidgeon

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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 (˜300 Å), 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. © 1996 Academic Press Limited.

Original languageEnglish
Pages (from-to)17-24
Number of pages8
JournalSuperlattices and Microstructures
Volume19
Issue number1
DOIs
Publication statusPublished - Jan 1996

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    Murdin, B. N., Langerak, C. J. G. M., Helm, M., Kruck, P., Heiss, W., Rosskopf, V., Strasser, G., Gornik, E., Dür, M., Goodnick, S. M., Lee, S. C., Galbraith, I., & Pidgeon, C. R. (1996). Time resolved studies of intersubband relaxation in GaAs/AlGaAs quantum wells below the optical phonon energy using a free electron laser. Superlattices and Microstructures, 19(1), 17-24. https://doi.org/10.1006/spmi.1996.0003