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arXiv 1012.1179cond-mat.mes-hall
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单CdMnTe量子点中磁极化子的形成和激子自旋弛豫

Magnetic polaron formation and exciton spin relaxation in single CdMnTe quantum dots

Łukasz Kłopotowski, Łukasz Cywiński, Piotr Wojnar, Valia Voliotis, Krzysztof Fronc, Tomasz Kazimierczuk, Andrzej Golnik, Marco Ravarro, Roger Grousson, Grzegorz… 展开作者

Łukasz Kłopotowski, Łukasz Cywiński, Piotr Wojnar, Valia Voliotis, Krzysztof Fronc, Tomasz Kazimierczuk, Andrzej Golnik, Marco Ravarro, Roger Grousson, Grzegorz Karczewski, Tomasz Wojtowicz

摘要:

我们研究了单个自组装CdMnTe量子点中自发铁磁有序的形成动力学。通过测量时间分辨的光致发光,我们确定的锰离子含量x从0.01到0.2变化的量子点的形成时间。在低x这些时间的数量级长于激子自旋弛豫时间从光致发光圆偏振的衰减评估。这使我们能够得出结论,自发磁化的方向是由一个瞬间Mn自旋波动,而不是从光学取向产生的。在较高的x,形成时间是相同的数量级,发现在以前的研究中更高的维度系统。我们还发现激子自旋弛豫随Mn浓度的增加而加速。

英文摘要:

We study the formation dynamics of a spontaneous ferromagnetic order in single self-assembled CdMnTe quantum dots. By measuring time-resolved photoluminescence, we determine the formation times for QDs with Mn ion contents x varying from 0.01 to 0.2. At low x these times are orders of magnitude longer than exciton spin relaxation times evaluated from the decay of photoluminescence circular polarization. This allows us to conclude that the direction of the spontaneous magnetization is determined by a momentary Mn spin fluctuation rather than resulting from an optical orientation. At higher x, the formation times are of the same order of magnitude as found in previous studies on higher dimensional systems. We also find that the exciton spin relaxation accelerates with increasing Mn concentration.

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