Relaxation dynamics of interminiband transitions and electron cooling in doped GaAs/AlGaAs superlattices

被引：0
|
作者：
Stehr, D. [1 ]
Winner, S. [1 ]
Helm, M. [1 ]
Andrews, A. M. [2 ]
Roch, T. [2 ]
Strasser, G. [2 ]
机构：
[1] Forschungszentrum Rossendorf EV, Inst Ion Beam Phys & Mat Res, POB 510119, D-01314 Dresden, Germany
[2] Inst Festkorperelektron, Vienna, Austria
来源：
PHYSICS OF SEMICONDUCTORS, PTS A AND B | 2007年 / 893卷
关键词：
superlattice; intersubband; miniband; ultrafast spectroscopy; relaxation;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
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页码：485 / +
页数：2
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