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arXiv 2002.05539cond-mat.mes-hall
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隧道结中电流波动的循环平稳三阶矩的基础和环境贡献

Fundamental and Environmental Contributions to the Cyclostationary Third Moment of Current Fluctuations in a Tunnel Junction

Pierre Février, Christian Lupien, Bertrand Reulet

摘要:

众所周知,隧道结产生的电流波动是非高斯的。然而,当在高频率和有限带宽下测量波动时,这种性质就丧失了。我们表明,在频率$f$隧道结产生的电场的正交显示三阶相关性,即偏斜,当结是电驱动在$3f$,揭示了泊松统计的势垒,即使在短的时间尺度上的电荷转移。除了从结的本征贡献,我们观察到额外的相关性引起的环境噪声在频率$f$,以及来自环境阻抗的反馈效应,不仅在频率$f$,但也在一些倍数的$f$。

英文摘要:

Current fluctuations generated by tunnel junctions are known to be non-Gaussian. However, this property is lost when fluctuations are measured at high frequency and limited bandwidth. We show that the quadratures of the electric field generated by a tunnel junction at frequency $f$ displays third order correlations, i.e. skewness, when the junction is electrically driven at $3f$, revealing the Poisonnian statistic of charge transfer by the barrier even at short time-scales. In addition to this intrinsic contribution from the junction, we observe extra correlations induced by the environmental noise at frequency $f$ as well as a feedback effects coming from the environmental impedance not only at frequency $f$ but also at some multiples of $f$.

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