Cooling and spin-relaxation dynamics of spin-polarized excitons in a diluted magnetic semiconductor quantum well

被引：0
|
作者：
Murayama, A. [1 ]
Saito, K. [1 ]
Souma, I. [1 ]
机构：
[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
来源：
PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, NO 1 | 2009年 / 6卷 / 01期
关键词：
D O I：
10.1002/pssc.200879876
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We show a systematic study on cooling and spin-relaxation dynamics of spin-polarized excitons in a diluted magnetic semiconductor quantum well of Cd(0.95)Mn(0.05)Te, by means of pump-probe absorption spectroscopy under magnetic fields. Time dependences of circularly polarized saturation absorption intensities after optical pumping showed the dynamics of carrier cooling and spin relaxation at spin-split exciton sublevels at various magnetic fields. Spin-polarized electrons at a higher-energy up-spin state relax to a lower-energy down-spin one with time constants ranging from 6 to 20 ps, depending on the magnetic field. Roles of phonon scattering and emission in the electron-spin relaxation are pointed out, in addition to a spin-flip process induced by local Mn spins via s-d exchange interaction. (C) 2009 WILEY-VCH Veriag GmbH & Co. KGaA, Weinheim
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页码：315 / 318
页数：4
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