High-density optical spin injection in self-assembled semiconductor quantum dots

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• 作者：Akihiro Murayama ; ^{murayama@ist.hokudai.ac.jp} ; Norihiro Tamura ; Tatsushiro Yamazaki ; Takayuki Kiba
• 关键词：Quantum dot ; Exciton ; Spin dynamics ; Spin injection ; Diluted magnetic semiconductor
• 刊名：Journal of Luminescence
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：133
• 期：Complete
• 页码：110-113
• 全文大小：285 K

文摘

High-density optical spin injection and the dynamics from a diluted magnetic semiconductor (DMS) of Zn_0.95Mn_0.05Se as a spin injector into self-assembled quantum dots of CdSe have been studied by means of time- and spin-resolved photoluminescence. Spin relaxation during the injection becomes significant with increasing the density of spin-polarized exciton in the DMS. This spin relaxation can be caused by the diffusive transfer of spin-polarized electrons through the barrier, when the energy of spin-polarized electron generated in the DMS exceeds the barrier energy due to a filling effect for localized-exciton states in the DMS.