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arXiv 1701.02103cond-mat.mes-hall
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量子点输运中的非更新统计

Nonrenewal statistics in transport through quantum dots

Krzysztof Ptaszynski

摘要:

连续隧穿事件之间的等待时间的分布是表征介观系统中电流波动的一种已经建立的方法。在这里,我调查机制产生随后的等待时间在两个模型系统,一对电容耦合量子点和一个单级点连接到自旋极化的引线之间的相关性。等待时间的相关性示出了系统的内部动态的洞察力,例如,它们允许区分不同的机制的噪声增强。此外,相关性的存在打破了更新理论的有效性。这增加了电流波动统计的独立累积量的数量,从而提供了关于输运机制的额外信息来源。我还提出了一种方法来推断存在的等待时间的相关性的基础上,低阶电流关联函数。这种方法提供了一种方法来扩展的非更新电流波动的分析系统,单电子计数是不可行的实验。实验相关的研究结果也进行了讨论,例如重新分析以前的结果,在量子点的运输建议。

英文摘要:

The distribution of waiting times between successive tunneling events is an already established method to characterize current fluctuations in mesoscopic systems. Here, I investigate mechanisms generating correlations between subsequent waiting times in two model systems, a pair of capacitively coupled quantum dots and a single-level dot attached to spin-polarized leads. Waiting time correlations are shown to give an insight into the internal dynamics of the system, for example they allow distinction between different mechanisms of the noise enhancement. Moreover, the presence of correlations breaks the validity of the renewal theory. This increases the number of independent cumulants of current fluctuation statistics, thus providing additional sources of information about the transport mechanism. I also propose a method for inferring the presence of waiting time correlations based on low-order current correlation functions. This method gives a way to extend the analysis of nonrenewal current fluctuations to the systems for which single-electron counting is not experimentally feasible. The experimental relevance of the findings is also discussed, for example reanalysis of previous results concerning transport in quantum dots is suggested.

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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