The modified Langevin description for probes in a nonlinear medium
The modified Langevin description for probes in a nonlinear medium
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DOI：
10.1088/1361-648x/29/6/064004
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发表时间：
2017-02-15
影响因子：
2.7
通讯作者：
Maes, Christian
中科院分区：
文献类型：
--
作者：
Krueger, Matthias;Maes, Christian
当探头的运动强烈扰动溶剂或镀液的热平衡时，后者的非线性响应必须进入探头的有效演化方程。我们利用浴池热平衡附近的二阶响应推导出了诱导的随机动力学。我们讨论了演化方程中新项的性质，它不再是纯耗散的，并讨论了与浴的动力学活性变化有关的探测器的新的时间尺度的出现。所得到的非线性广义朗之万方程的一个主要应用是研究粘弹性介质中的胶体运动。
When the motion of a probe strongly disturbs the thermal equilibrium of the solvent or bath, the nonlinear response of the latter must enter the probe's effective evolution equation. We derive that induced stochastic dynamics using second order response around the bath thermal equilibrium. We discuss the nature of the new term in the evolution equation which is no longer purely dissipative, and the appearance of a novel time-scale for the probe related to changes in the dynamical activity of the bath. A major application for the obtained nonlinear generalized Langevin equation is in the study of colloid motion in a visco-elastic medium.