Temperature dependence of the dynamics of optical spin injection in self-assembled InGaAs quantum dots

被引：26

作者：

Kiba, Takayuki ^{[1
]}

Yang, Xiao-jie ^{[1
]}

Yamamura, Takafumi ^{[1
]}

Kuno, Yuki ^{[1
]}

Subagyo, Agus ^{[1
]}

Sueoka, Kazuhisa ^{[1
]}

Murayama, Akihiro ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Informat Sci & Technol, Kita Ku, Sapporo, Hokkaido 0600814, Japan

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 08期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

ELECTRON-SPIN; RELAXATION DYNAMICS; TIME;

D O I：

10.1063/1.4819208

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the temperature dependence of the dynamics of optical spin injection from GaAs barriers into self-assembled quantum dots (QDs) of In0.5Ga0.5As. Transient circular-polarization properties of photoluminescence (PL) from excited states in QDs depend strongly on the temperature (T) and rate-equation analysis shows the T-dependent dynamics of spin injection. The filling for the majority spin states is strongly suppressed as T increases above 100 K, enhancing the circular polarization degree of PL. This suppression originates from thermal redistribution of electrons from the excited states in the QDs to the barrier. In contrast, spin relaxation during the injection becomes significant at T >= 150 K. (C) 2013 AIP Publishing LLC.

引用

页数：5

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