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Proceedings Paper

Two color pump-probe studies of intraminiband relaxation in doped GaAs/AlGaAs superlattices
Author(s): D. Stehr; M. Wagner; H. Schneider; M. Helm; A. M. Andrews; T. Roch; G. Strasser
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Paper Abstract

In this work we investigate the miniband relaxation dynamics of electrons in doped GaAs/AlGaAs superlattices by twocolor infrared pump-probe experiments using a free electron laser synchronized to a table top broadband IR source. In contrast to single color experiments, by this technique we are able to separate the different contributions from inter- and intraminiband relaxation to the transient behavior after an ultrafast excitation. In particular, the intraminiband relaxation is studied for different miniband widths, below and above the optical phonon energy of GaAs. For minibands wider than this critical value we find fast relaxation, nearly constant for different excitation intensities whereas for narrow minibands, a strong temperature and intensity dependence of the relaxation is found. The results are in good agreement with previously published Monte Carlo simulations.

Paper Details

Date Published: 6 February 2009
PDF: 8 pages
Proc. SPIE 7214, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIII, 72141N (6 February 2009); doi: 10.1117/12.809347
Show Author Affiliations
D. Stehr, Univ. of California, Santa Barbara (United States)
Forschungszentrum Dresden-Rossendorf e. V. (Germany)
M. Wagner, Forschungszentrum Dresden-Rossendorf e. V. (Germany)
H. Schneider, Forschungszentrum Dresden-Rossendorf e. V. (Germany)
M. Helm, Forschungszentrum Dresden-Rossendorf e. V. (Germany)
A. M. Andrews, Technische Univ. Wien (Austria)
T. Roch, Technische Univ. Wien (Austria)
G. Strasser, Technische Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 7214:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIII
Kong-Thon Tsen; Jin-Joo Song; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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