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arXiv 1010.4284cond-mat.mes-hall
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稀磁量子阱中的电子自旋退相干

Electron spin decoherence in diluted magnetic quantum wells

P. M. Shmakov, A. P. Dmitriev, V. Yu. Kachorovskii

摘要:

我们研究了稀磁量子阱中的电子自旋动力学。电子通过与由磁场极化的随机分布的磁性离子的交换相互作用耦合。这种耦合导致自旋弛豫和自旋退相干。我们证明,即使是非常小的量子阱宽度的空间波动显着增加退相干率。根据交换相互作用的强度和涨落的幅度,退相干可以是均匀的或不均匀的。在均匀区,电子自旋的横向(相对于磁场)分量在短时间尺度上指数衰减,而长时间自旋动力学是非指数的,表现出长寿命的幂律尾。在非均匀情况下,横向自旋分量随时间的二次方指数衰减。

英文摘要:

We study electron spin dynamics in diluted magnetic quantum wells. The electrons are coupled by exchange interaction with randomly distributed magnetic ions polarized by magnetic field. This coupling leads to both spin relaxation and spin decoherence. We demonstrate that even very small spatial fluctuations of quantum well width dramatically increase rate of decoherence. Depending on the strength of exchange interaction and the amplitude of the fluctuations the decoherence can be homogeneous or inhomogeneous. In the homogeneous regime, the transverse (with respect to magnetic field) component of the electron spin decays on the short time scale exponentialy, while the long-time spin dynamics is non-exponential demonstrating long-lived power law tail. In the inhomogeneous case, the transverse spin component decays exponentially with the exponent quadratic in time.

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