Relaxation Dynamics of Interminiband Transitions and Electron Cooling in Doped GaAs/AlGaAs Superlattices

In this work we investigated the transient behavior of interminiband transitions in a doped GaAs/AlGaAs superlattice using the infrared picosecond pulses delivered by a free electron laser. We found a fast bleaching component, followed by relaxation and thermalization on a time scale of few ps. Ther...

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Bibliographic Details
Main Authors: Stehr, D, Winnerl, S, Helm, M, Andrews, A M, Roch, T, Strasser, G
Format: Conference Proceeding
Language:English
Online Access:Get full text
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Summary:In this work we investigated the transient behavior of interminiband transitions in a doped GaAs/AlGaAs superlattice using the infrared picosecond pulses delivered by a free electron laser. We found a fast bleaching component, followed by relaxation and thermalization on a time scale of few ps. Thereafter the cooling of the electrons in the ground miniband is observed on a timescale of tens of ps. The cooling can show either positive of negative change in transmission, deriving from the temperature dependence of the absorption spectrum at the respective wavelength.
ISSN:0094-243X
DOI:10.1063/1.2729977