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Dynamical correlations in electronic transport through a system of coupled quantum dots

机译：通过耦合量子点系统的电子传输中的动力学相关

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Current auto and cross correlations are studied in a system of two capacitively coupled quantum dots. We are interested in a role of Coulomb interaction in dynamical correlations, which occur outside the Coulomb blockade region (for high bias). After decomposition of the current correlation functions into contributions between individual tunneling events, we can show which of them are relevant and lead to sub-/super-Poissonian shot noise and negative/positive cross correlations. The results are differentiated for weak and strong interdot couplings. Interesting results are for the strong-coupling case when electron transfer in one of the channel is strongly correlated with charge drag in the second channel. We show that cross correlations are nonmonotonic functions of bias voltage and they are in general negative (except some cases with asymmetric tunnel resistances). This is effect of local potential fluctuations correlated by Coulomb interaction, which mimics the Pauli exclusion principle.
机译：在两个电容耦合量子点的系统中研究了当前的自相关和互相关。我们对库仑相互作用在动力学相关中的作用感兴趣，这种相互作用发生在库仑阻塞区域之外（对于高偏差）。将当前相关函数分解为各个隧道事件之间的贡献后，我们可以显示它们中的哪些是相关的，并导致亚/超泊松散粒噪声和负/正互相关。对于弱和强的点间耦合，结果有所不同。对于强耦合情况，当其中一个通道中的电子转移与第二个通道中的电荷阻力密切相关时，会产生有趣的结果。我们表明，互相关是偏置电压的非单调函数，并且它们通常是负的（某些情况下具有非对称的隧道电阻）。这是与库仑相互作用相关的局部潜在波动的影响，它模仿了保利排斥原理。

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