Thermally Activated Contact Strengthening Explains Nonmonotonic Temperature and Velocity Dependence of Atomic Friction
Thermally Activated Contact Strengthening Explains Nonmonotonic Temperature and Velocity Dependence of Atomic Friction
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DOI：
10.1103/physrevx.3.041020
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发表时间：
2013-11
影响因子：
12.5
通讯作者：
M. Evstigneev;P. Reimann
中科院分区：
文献类型：
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作者：
M. Evstigneev;P. Reimann
Universita´t Bielefeld, Fakultafur Physik, 33615 Bielefeld, 德国（2013 年 9 月 3 日收到；2013 年 10 月 18 日收到修订稿；2013 年 11 月 26 日出版）虽然完善的原子摩擦 Prandtl-Tomlinson (PT) 模型预测摩擦力随温度减小并随速度增大，但最近的几个实验报告了非单调温度依赖性并且速度依赖性也可能降低。我们提出了 PT 模型的最小扩展，纳入热激活接触强化的可能性，并提供一个通用框架来定量解释所有这些“异常”实验结果，以及先前已知的“正常”（类 PT）行为。
Universita¨t Bielefeld, Fakulta¨tfu¨r Physik, 33615 Bielefeld, Germany(Received 3 September 2013; revised manuscript received 18 October 2013; published 26 November 2013)While the well-established Prandtl-Tomlinson (PT) model of atomic friction predicts that the frictionforce decreases with temperature and grows with velocity, several recent experiments reportedthat a nonmonotonic temperature dependence and a decreasing velocity dependence may alsooccur. We propose a minimal extension of the PT model, incorporating the possibility of thermallyactivated contact strengthening and providing one common framework to quantitatively explain all those‘‘anomalous’’ experimental findings, as well as the previously known ‘‘normal’’ (PT-like) behavior.