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.
引用
收藏
页码：485 / +
页数：2
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