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arXiv 1707.00441cond-mat.mes-hall
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双量子点中自旋动力学的等待时间分布

Waiting time distribution revealing the internal spin dynamics in a double quantum dot

Krzysztof Ptaszynski

摘要:

利用量子主方程分析了电子通过自旋极化导线上的双量子点分子单向电子输运的等待时间分布和零频全计数统计。的等待时间分布表现出一个非平凡的依赖于点之间的交换耦合的值和所施加的磁场的梯度,这揭示了分子的自旋状态之间的振荡。另一方面,零频率全计数统计与上述量无关,因此无法洞察内部动态。等待时间分布和零频全计数统计量给出的信息不等价,这与两个因素有关。首先,它可以解释为对系统动态的不同时间尺度的敏感性。其次,它与后续等待时间之间的相关性的存在,这使得更新理论,全计数统计和等待时间分布,不再适用。这项研究突出了特别有用的等待时间分布的内部动态的介观系统的分析。

英文摘要:

Waiting time distribution and the zero-frequency full counting statistics of unidirectional electron transport through a double quantum dot molecule attached to spin-polarized leads are analyzed using the quantum master equation. The waiting time distribution exhibits a non-trivial dependence on the value of the exchange coupling between the dots and the gradient of the applied magnetic field, which reveals the oscillations between the spin states of the molecule. The zero-frequency full counting statistics, on the other hand, is independent of the aforementioned quantities, thus giving no insight into the internal dynamics. The fact that the waiting time distribution and the zero-frequency full counting statistics give a non-equivalent information is associated with two factors. Firstly, it can be explained by the sensitivity to different timescales of the dynamics of the system. Secondly, it is associated with the presence of the correlation between subsequent waiting times, which makes the renewal theory, relating the full counting statistics and the waiting time distribution, not longer applicable. The study highlights the particular usefulness of the waiting time distribution for the analysis of the internal dynamics of mesoscopic systems.

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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