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arXiv 0709.2779cond-mat.mes-hallcond-mat.str-el
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超小量子点自旋转移的全计数统计

Full counting statistics of spin transfer through ultrasmall quantum dots

T. L. Schmidt, A. Komnik, A. O. Gogolin

摘要:

我们分析了电子通过与金属电极耦合的超小量子点转移的自旋分辨全计数统计。由安德森哈密顿量建模的设置,我们明确地考虑到现场库仑排斥$U$。我们计算了在一个固定的时间间隔内转移一定数量的电子与预先选定的自旋取向的概率的累积生成函数。有了累积量母函数,我们就可以计算自旋电子学新兴领域中最重要的自旋流关联。我们证实了现有的结果的电荷统计和报告的发现的自旋向上和向下极化的电子流之间的新类型的相关性,这有可能成为一个强大的新仪器的纳米结构中的近藤效应的调查。

英文摘要:

We analyze the spin-resolved full counting statistics of electron transfer through an ultrasmall quantum dot coupled to metallic electrodes. Modelling the setup by the Anderson Hamiltonian, we explicitly take into account the onsite Coulomb repulsion $U$. We calculate the cumulant generating function for the probability to transfer a certain number of electrons with a preselected spin orientation during a fixed time interval. With the cumulant generating function at hand we are then able to calculate the spin current correlations which are of outmost importance in the emerging field of spintronics. We confirm the existing results for the charge statistics and report the discovery of the new type of correlation between the spin-up and -down polarized electrons flows, which has a potential to become a powerful new instrument for the investigation of the Kondo effect in nanostructures.

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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