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arXiv 1302.3769cond-mat.mes-hall
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共振光激发下半导体量子点中Mn原子的自旋动力学

Spin dynamics of a Mn atom in a semiconductor quantum dot under resonant optical excitation

S. Jamet, H. Boukari, L. Besombes

摘要:

我们分析了在共振光激发下,单个磁性原子(Mn)嵌入II-VI族半导体量子点中的自旋动力学。除了标准的光泵浦预期的共振激发,我们表明,对于特定条件的激光失谐和激发强度,自旋人口可以被困在共振激发的状态。考虑到Mn原子的电子和核自旋耦合的相干自旋动力学的共振激光场的光修饰的这种效果建模。这种自旋布居捕获机制由与激光场的耦合和由量子点平面中的应变的各向异性引起的不同Mn自旋态之间的相干相互作用的组合效应控制。

英文摘要:

We analyze the spin dynamics of an individual magnetic atom (Mn) inserted in a II-VI semiconductor quantum dot under resonant optical excitation. In addition to standard optical pumping expected for a resonant excitation, we show that for particular conditions of laser detuning and excitation intensity, the spin population can be trapped in the state which is resonantly excited. This effect is modeled considering the coherent spin dynamics of the coupled electronic and nuclear spin of the Mn atom optically dressed by a resonant laser field. This spin population trapping mechanism is controlled by the combined effect of the coupling with the laser field and the coherent interaction between the different Mn spin states induced by an anisotropy of the strain in the plane of the quantum dot.

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