Pulling a harmonically bound particle subjected to Coulombic friction: A nonequilibrium analysis
Pulling a harmonically bound particle subjected to Coulombic friction: A nonequilibrium analysis
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拉动受库仑摩擦作用的简谐束缚粒子：非平衡分析
DOI：
10.1103/physreve.106.024407
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发表时间：
2022
影响因子：
2.4
通讯作者：
Lau, A. W.
中科院分区：
文献类型：
--
作者：
Feghhi, T.;Tichy, W.;Lau, A. W.
我们解决了干摩擦的影响，它最近才出现，在一些生物系统中发挥重要作用。特别地，我们研究了一个介观粒子的非平衡动力学，它被束缚在一个弹簧上，被以一定的速度拉着，在一个有干摩擦的嘈杂环境中在一个表面上运动。我们用一个与速度符号成正比的项对干摩擦进行了现象学建模，并通过对朗格万方程的数值模拟表明：(a)摩擦力与牵引速度的对数成比例，(b)远离潜在最小值的空间位移的概率分布函数是非高斯分布，(c)波动耗散定理如预期的那样被违反。但(d)功函数服从平稳波动定理，有效温度与系统噪声有关。
We address the effects of dry friction, which has emerged only recently to play an important role in some biological systems. In particular, we investigate the nonequilibrium dynamics of a mesoscopic particle, bound to a spring being pulled at a definite speed, moving on a surface with dry friction in a noisy environment. We model the dry friction phenomenologically with a term that is proportional to the sign of the velocity, and by means of numerical simulations of a Langevin equation we show that (a) the frictional force scales with the logarithm of the pulling velocity, (b) the probability distribution function of the spatial displacement away from the potential minimum is non-Gaussian, (c) the fluctuation-dissipation theorem is violated as expected, but (d) the work function obeys the stationary fluctuation theorem, with an effective temperature related to the noise of the system.