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

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

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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