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  4. Femtosecond pump-probe spectroscopy of intersubband relaxation dynamics in narrow InGaAs/AlAsSb quantum well structures
 
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2006
Journal Article
Titel

Femtosecond pump-probe spectroscopy of intersubband relaxation dynamics in narrow InGaAs/AlAsSb quantum well structures

Abstract
Intersubband relaxation dynamics in InGaAs/AlAsSb multiquantum wells (QWs) is studied by single-color femtosecond pump-probe measurements. At early delay times, all samples show an exponential decay of the transient transmission occurring with time constants of the order of a picosecond. The relaxation dynamics at later delay times strongly depend on both QW thickness and doping location. A non-single-exponential decay behavior indicates extra competing relaxation channels, as further confirmed by solving three-level rate equations. It is shown that slowly decaying components are due to electron transfer to states related to indirect valleys in the wells or in the barriers.
Author(s)
Tribuzy, C.V.-B.
Ohser, S.
Winnerl, S.
Grenzer, J.
Schneider, H.
Helm, M.
Neuhaus, J.
Dekorsy, T.
Biermann, K.
Künzel, H.
Zeitschrift
Applied Physics Letters
Thumbnail Image
DOI
10.1063/1.2360242
Language
English
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Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut HHI
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