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arXiv 1606.06110physics.chem-ph
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金属表面附近的电子摩擦:分子-金属耦合依赖于核坐标的情况

Electronic friction near metal surfaces: a case where molecule-metal couplings depend on nuclear coordinates

Wenjie Dou, Joseph E. Subotnik

摘要:

在分子-金属耦合依赖于核坐标的一般情况下,我们推导出了一个明确的形式的电子摩擦的感觉由一个分子附近的金属表面。我们的工作概括了von Oppen等人的先前研究[Beilstein Journal of Nanotechnology,3,144,2012],其中我们现在超越了Condon近似(即分子-金属耦合不保持恒定)。使用绝热极限下的非平衡格林函数形式,我们表明波动的金属分子耦合会导致新的摩擦阻尼项和随机力,以及对平均力势的修正。数值试验进行了修改后的经典主方程相比,我们的结果表明,违反康登近似动力学可以有很大的影响。

英文摘要:

We derive an explicit form for the electronic friction as felt by a molecule near a metal surface for the general case that molecule-metal couplings depend on nuclear coordinates. Our work generalizes a previous study by von Oppen et al [Beilstein Journal of Nanotechnology, 3, 144, 2012], where we now go beyond the Condon approximation (i.e. molecule-metal couplings are not held constant). Using a non-equilibrium Green's function formalism in the adiabatic limit, we show that fluctuating metal-molecule couplings lead to new frictional damping terms and random forces, plus a correction to the potential of mean force. Numerical tests are performed and compared with a modified classical master equation; our results indicate that violating the Condon approximation can have a large effect on dynamics.

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