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arXiv 1303.7175cond-mat.mes-hall
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相互作用纳米尺度系统中的含时阶乘累积量

Time-dependent factorial cumulants in interacting nano-scale systems

Dania Kambly, Christian Flindt

摘要:

我们讨论了相互作用的纳米尺度系统中的含时阶乘累积量。最近的理论工作表明,两端导体中非相互作用电子的全计数统计总是广义二项的,因此母函数的零点是实的和负的。然而,由于在传输中引入了相互作用,生成函数的零点可能变得复杂。这会产生可衡量的后果:随着母函数的零点远离实轴,输运的高阶阶乘累积量成为时间的振荡函数。在这里,我们证明了这种现象的电荷传输模型,通过相干耦合量子点连接到电压偏置电极。在没有相互作用的情况下,阶乘累积量是观测时间的单调函数。相反,当引入相互作用时,阶乘累积量作为时间的函数强烈振荡。我们评论可能的测量振荡阶乘累积量,并概述了进一步调查的几种途径。

英文摘要:

We discuss time-dependent factorial cumulants in interacting nano-scale systems. Recent theoretical work has shown that the full counting statistics of non-interacting electrons in a two-terminal conductor is always generalized binomial and the zeros of the generating function are consequently real and negative. However, as interactions are introduced in the transport, the zeros of the generating function may become complex. This has measurable consequences: With the zeros of the generating function moving away from the real-axis, the high-order factorial cumulants of the transport become oscillatory functions of time. Here we demonstrate this phenomenon on a model of charge transport through coherently coupled quantum dots attached to voltage-biased electrodes. Without interactions, the factorial cumulants are monotonic functions of the observation time. In contrast, as interactions are introduced, the factorial cumulants oscillate strongly as functions of time. We comment on possible measurements of oscillating factorial cumulants and outline several avenues for further investigations.

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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