Fast spin relaxation in InGaN/GaN multiple quantum wells

被引：1
|
作者：
Brown, J.
Wells, J. P. R.
Hashemizadeh, S. A.
Parbrook, P. J.
Wang, T.
Fox, A. M.
Mowbray, D. J.
Skolnick, M. S.
机构：
[1] Univ Sheffield, Dept Phys & Astron, Low Dimens Struct & Devices Grp, Sheffield S3 7RH, S Yorkshire, England
[2] Univ Sheffield, EPSRC Natl Ctr Technol 3 5, Sheffield S1 3JD, S Yorkshire, England
来源：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2006年 / 243卷 / 07期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1002/pssb.200565271
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We report measurements of a fast spin relaxation in InGaN multi-quantum wells (MQW) using femtosecond circularly polarised pump-probe spectroscopy. These reveal quantum beats in the spin polarisation arising from a 1.6 meV fine structure splitting of the excitonic levels. We attribute this splitting to exchange interactions in the narrow quantum wells studied. The 5 K spin coherence time was measured to be 450 fs, a value which decreases by a factor of approximately two by 50 K. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
引用
收藏
页码：1643 / 1646
页数：4
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