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首页> 外文期刊>Physical review >Electron-electron correlations in molecular tunnel junctions: A diagrammatic approach
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Electron-electron correlations in molecular tunnel junctions: A diagrammatic approach

机译：分子隧道结中的电子-电子相关：图解方法

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摘要

In this work, the systematic studies of the effect of electron correlations in a bridge of a tunneling junction on transport properties is presented while the leads' electrons are considered to be noninteracting. A diagrammatic technique with respect to the Coulomb interaction is developed for various nonequilibrium bridge Green's functions. Dyson equations on a Keldysh contour for different Keldysh functions is derived. It is shown exactly that the structure of the Dyson equation Keldysh functions of the bridge molecule is the same as for a gas-phase bridge molecule where the zero order nonequilibrium Green's functions are modified by the interaction with the leads' electrons. These Green's functions contain nonvanishing imaginary parts that depend on the interaction between leads' and bridge electrons. As an example, the nonequilibrium bridge Green's functions in the random phase approximation are found where both direct and exchange terms are taken into account.
机译：在这项工作中，系统地研究了在隧道结的桥中电子相关对传输特性的影响，而铅的电子被认为是非相互作用的。针对各种非平衡桥格林函数开发了一种关于库仑相互作用的图解技术。推导了针对不同Keldysh函数的Keldysh轮廓上的戴森方程。准确地表明，桥分子的戴森方程Keldysh函数的结构与气相桥分子的结构相同，在气相桥分子中，零级非平衡格林函数通过与引线电子的相互作用而被修饰。这些格林函数包含不消失的虚部，这些虚部取决于引线和桥电子之间的相互作用。例如，在考虑了直接项和交换项的情况下，发现了随机相位近似中的非平衡桥格林函数。

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