Exciton spin alignment observed via Hanle effect in single quantum dots
Exciton spin alignment observed via Hanle effect in single quantum dots
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通过单量子点中的汉勒效应观察激子自旋排列
DOI：
10.1002/pssc.201000685
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
S. Muto
中科院分区：
文献类型：
--
作者：
R. Kaji;S. Adachi;S. Muto
利用类Hanle测量方法研究了InAlAs/AlGaAs单量子点激子发射的偏振特性。面内交换场驱动激子自旋旋进，即使在零外磁场下也能实现发射极化从圆到线的转换，反之亦然。纵向外加磁场使转换率提高到理论极限的50%，此时的场强与交换场相当。最后讨论了价带混合对极化转换的影响。（© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA，魏因海姆）
Polarization properties of the exciton emissions from single InAlAs/AlGaAs quantum dots were investigated by using Hanle‐like measurement. The in‐plane exchange field drives the exciton spin precession even under zero external magnetic field and the polarization of emissions can be converted from circular to linear and vice versa.Longitudinal applied magnetic field increases the conversion ratio up to the theoretical limit ∼50%, where the field strength is comparable to the exchange field. Finally, the effect of valence band mixing on the polarization conversion was discussed. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)