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arXiv 1703.09441cond-mat.mes-hall
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带正电磁性量子点中Mn-空穴混合自旋的共振光致发光和动力学

Resonant photoluminescence and dynamics of a hybrid Mn-hole spin in a positively charged magnetic quantum dot

A. Lafuente-Sampietro, H. Boukari, L. Besombes

摘要:

我们分析,通过共振光致发光,一个单独的磁性原子(锰)耦合到一个半导体量子点中的孔的自旋动力学。CdTe/ZnTe量子点中的混合Mn-空穴自旋和带正电荷的激子形成了可以光学寻址的$Λ$系统的系综。利用共振光致发光的自相关和共振光抽运实验研究了该多级自旋系统中的自旋弛豫通道。我们确定的混合Mn空穴自旋的Mn空穴交换相互作用和耦合到声学声子的相互作用驱动的一个有效的弛豫通道。我们还表明,光学$Λ$系统连接通过低效的自旋翻转比可以增强弱横向磁场。用完全速率方程模型很好地描述了p掺杂磁性量子点的共振光致发光动力学。我们的结果表明,在具有大的重空穴/轻空穴分裂的量子点系统中,可以获得长寿命的Mn-空穴杂化自旋.

英文摘要:

We analyze, through resonant photoluminescence, the spin dynamics of an individual magnetic atom (Mn) coupled to a hole in a semiconductor quantum dot. The hybrid Mn-hole spin and the positively charged exciton in a CdTe/ZnTe quantum dot forms an ensemble of $Λ$ systems which can be addressed optically. Auto-correlation of the resonant photoluminescence and resonant optical pumping experiments are used to study the spin relaxation channels in this multilevel spin system. We identified for the hybrid Mn-hole spin an efficient relaxation channel driven by the interplay of the Mn-hole exchange interaction and the coupling to acoustic phonons. We also show that the optical $Λ$ systems are connected through inefficient spin-flips than can be enhanced under weak transverse magnetic field. The dynamics of the resonant photoluminescence in a p-doped magnetic quantum dot is well described by a complete rate equation model. Our results suggest that long lived hybrid Mn-hole spin could be obtained in quantum dot systems with large heavy-hole/light-hole splitting.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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