Non-equilibrium work distribution for interacting colloidal particles under friction
Non-equilibrium work distribution for interacting colloidal particles under friction
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摩擦下相互作用的胶体颗粒的非平衡功分布
DOI：
10.1088/1367-2630/17/4/045026
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发表时间：
2015
影响因子：
3.3
通讯作者：
Bechinger
中科院分区：
文献类型：
--
作者：
Gomez‐Solano;Bechinger
我们的实验研究的非平衡稳态分布的工作所做的外力介观系统与许多耦合的自由度：胶体晶体机械驱动整个相称的周期性光场。由于该系统模仿的时空动态的晶体表面上移动的波纹衬底，我们的研究结果显示了一般属性的原子平面表面进行摩擦的工作分布。我们解决的几个参数的作用，可以影响的形状的工作分布，例如粒子的数量用于本地探测系统的属性和时间间隔来测量的工作。我们发现，当调整控制参数诱导粒子从衬底脱钉，有一个突变的形状的工作分布。而在完全静态和滑动摩擦制度的工作分布是高斯，非高斯尾巴出现由于粒子动力学的时空异质性在这两个制度之间的过渡。
We experimentally investigate the non-equilibrium steady-state distribution of the work done by an external force on a mesoscopic system with many coupled degrees of freedom: a colloidal crystal mechanically driven across a commensurate periodic light field. Since this system mimics the spatiotemporal dynamics of a crystalline surface moving on a corrugated substrate, our results show general properties of the work distribution for atomically flat surfaces undergoing friction. We address the role of several parameters which can influence the shape of the work distribution, eg the number of particles used to locally probe the properties of the system and the time interval to measure the work. We find that, when tuning the control parameters to induce particle depinning from the substrate, there is an abrupt change of the shape of the work distribution. While in the completely static and sliding friction regimes the work distribution is Gaussian, non-Gaussian tails show up due to the spatiotemporal heterogeneity of the particle dynamics during the transition between these two regimes.