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arXiv 1407.4529cond-mat.mes-hall
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电荷中性隧道耦合量子点的自旋动力学和磁光响应

Spin dynamics and magneto-optical response in charge-neutral tunnel-coupled quantum dots

Michał Gawełczyk, Paweł Machnikowski

摘要:

考虑量子点间载流子隧穿效应,建立了非掺杂双量子点结构中电子和空穴自旋动力学模型。考虑到还存在一个平面内或倾斜的磁场,我们提供了模拟的磁光实验,如时间分辨克尔旋转测量,这是目前在这样的结构上进行探测的时间自旋动力学。与我们的模型,我们重现实验观察到的效果的自旋极化寿命的延长所造成的空间电荷分离,这可能会发生在这种类型的结构。此外,我们提供了一些定性的预测有关的必要条件,观察这种效果,以及有关可能的渠道,其抑制,包括自旋轨道耦合,导致隧道的载流子伴随着自旋翻转。我们还考虑了磁场倾斜的影响,这将导致一个有趣的自旋极化动力学。

英文摘要:

We model the electron and hole spin dynamics in an undoped double quantum dot structure, considering the carrier tunneling between quantum dots. Taking into account also the presence of an in-plane or tilted magnetic field, we provide the simulation of magneto-optical experiments, like the time resolved Kerr rotation measurement, which are performed currently on such structures to probe the temporal spin dynamics. With our model, we reproduce the experimentally observed effect of the extension of the spin polarization life time caused by the spatial charge separation, which may occur in structures of this type. Moreover, we provide a number of qualitative predictions concerning the necessary conditions for observation of this effect as well as about possible channels of its suppression, including the spin-orbit coupling, which leads to tunneling of carriers accompanied by a spin-flip. We consider also the impact of the magnetic field tilting, which results in an interesting spin polarization dynamics.

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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