Transfer dynamics of spin-polarized excitons in ZnCdMnSe/ZnCdSe double quantum wells

被引：0

作者：

Park, J. H. ^{[1
]}

Souma, I. ^{[1
]}

Oka, Y. ^{[1
]}

Murayama, A. ^{[1
]}

Dagnelund, D. ^{[2
]}

Buyanova, I. A. ^{[2
]}

Chen, W. M. ^{[2
]}

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[2] Linkoping Univ, Dept Phys Chem & Biol, S-58183 Linkoping, Sweden

来源：

JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2008年 / 53卷 / 01期

关键词：

spin transport; spin injection; exciton transfer; spin dynamics; diluted magnetic semiconductor; qquantum well;

D O I：

10.3938/jkps.53.167

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the transfer dynamics of spin-polarized excitons in diluted magnetic semiconductor (DMS) double quantum wells (QWs) of ZnCdMnSe/ZnCdSe, where the spin-polarized excitons tunnel from the non-magnetic ZnCdSe to DMS-ZnCdMnSe wells and subsequently relax to the ground state in the DMS well with phonon emissions. The exciton-transfer time decreases when the exciton-energy difference between both the wells is equal to the one-LO-phonon energy, indicating the LO-phonon-assisted acceleration of the spin transfer. Moreover, the exciton transfer alters into the separate transfer of the electron and the heavy hole when the electron potential difference becomes larger than the LO-phonon energy. This observation demonstrates the importance of energy-relaxation dynamics in the spatial transport of spins in semiconductor quantum structures.

引用

页码：167 / 170

页数：4

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