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Current-induced atomic dynamics, instabilities, and Raman signals: Quasiclassical Langevin equation approach

机译:电流感应的原子动力学,不稳定性和拉曼信号:准经典兰格文方程方法

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We derive and employ a semiclassical Langevin equation obtained from path integrals to describe the ionic dynamics of a molecular junction in the presence of electrical current. The electronic environment serves as an effective nonequilibrium bath. The bath results in random forces describing Joule heating, current-induced forces including the nonconservative wind force, dissipative frictional forces, and an effective Lorentz-type force due to the Berry phase of the nonequilibrium electrons. Using a generic two-level molecular model, we highlight the importance of both current-induced forces and Joule heating for the stability of the system. We compare the impact of the different forces, and the wide-band approximation for the electronic structure on our result. We examine the current-induced instabilities (excitation of runaway "waterwheel" modes) and investigate the signature of these in the Raman signals.
机译:我们推导并采用了从路径积分获得的半经典Langevin方程来描述存在电流时分子结的离子动力学。电子环境可作为有效的非平衡浴。熔池产生描述焦耳热的随机力,包括非保守风力的电流感应力,耗散摩擦力以及由于非平衡电子的贝里相引起的有效洛伦兹型力。使用通用的两级分子模型,我们强调了电流感应力和焦耳热对于系统稳定性的重要性。我们比较了不同力的影响,以及电子结构的宽带近似对结果的影响。我们检查了电流引起的不稳定性(失控的“水车”模式的激发),并研究了它们在拉曼信号中的特征。

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