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Langevin equation for a system nonlinearly coupled to a heat bath

机译:非线性耦合到热浴系统的Langevin方程

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摘要

Direct molecular dynamics simulations of multiatomic systems, such as adsorbed atoms or clusters on crystalline surface, surface-atom scattering, atomic friction, etc., are known to have severe time-scale and size limitations. Therefore, an alternative approach based on Langevin dynamics is often used. In this work, we derive the generalized Langevin equation for a system in contact with a heat bath. In contrast to the previous treatments focusing on linear system-bath coupling, we consider a general case where the corresponding interaction potential has an arbitrary functional form, but is weak in comparison to the coupling between the bath particles. The validity of our results is demonstrated on two simple models.
机译:已知多原子系统的直接分子动力学模拟,例如晶体表面上吸附的原子或簇,表面原子散射,原子摩擦等,都具有严重的时标和尺寸限制。因此,经常使用基于Langevin动力学的替代方法。在这项工作中,我们推导了与热浴接触的系统的广义Langevin方程。与以前的专注于线性系统-浴耦合的处理方法相反,我们考虑了一种一般情况,其中相应的相互作用势具有任意的函数形式,但与浴粒子之间的耦合相比却较弱。我们的结果的有效性在两个简单的模型上得到了证明。

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