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Multimode vibrational effects in single-molecule conductance: A nonequilibrium Green's function approach

机译:单分子电导中的多模振动效应:一种非平衡格林函数方法

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摘要

The role of multimode vibrational dynamics in electron transport through single-molecule junctions is investigated. The study is based on a generic model, which describes charge transport through a single molecule that is attached to metal leads. To address vibrationally coupled electron transport, we employ a non-equilibrium Green's function approach that extends a method recently proposed by Galperin et al. [Phys. Rev. B 73, 045314 (2006)] to multiple vibrational modes. The methodology is applied to two systems: a generic model with two vibrational degrees of freedom and benzenedibutanethiolate covalently bound to gold electrodes. The results show that the coupling to multiple vibrational modes can have a significant effect on the conductance of a molecular junction. In particular, we demonstrate the effect of the electronically induced coupling between different vibrational modes and study nonequilibrium vibrational effects by calculating the current-induced excitation of the vibrational modes.
机译:研究了多模振动动力学在电子通过单分子结传输中的作用。该研究基于通用模型,该模型描述了通过附着在金属引线上的单个分子进行的电荷传输。为了解决振动耦合电子传输,我们采用了非平衡格林函数方法,该方法扩展了Galperin等人最近提出的方法。 [物理B 73,045314(2006)。]。该方法学适用于两个系统:具有两个振动自由度的通用模型,以及共价结合到金电极上的苯二丁硫醇盐。结果表明,耦合到多个振动模式可以对分子结的电导有显着影响。特别是,我们演示了不同振动模式之间电子感应耦合的效果,并通过计算电流引起的振动模式激励来研究非平衡振动效果。

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