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arXiv 1402.3576cond-mat.mes-hall
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离面和面内驱动对原子尺度摩擦的影响

Out-of-plane and in-plane actuation effects on atomic-scale friction

O. Y. Fajardo, E. Gnecco, J. J. Mazo

摘要:

本文利用广义Prandtl-Tomlinson模型研究了晶体表面上受弹性拉伸的针尖上的摩擦力受面外、面内接触振动和温度的影响。平均摩擦力显着降低的频率范围内确定的粘滑运动和粘性阻尼伴随的尖端运动的“搓衣板”频率。在面内激励的情况下,得到了激励幅值与表面势有效振幅之间的近似线性关系,推广了面外激励的类似结论.温度引起额外的摩擦减少与正式协议的反应速率理论的预测在没有接触振动的比例关系。在这种情况下,致动效应可以通过有效能量来描述,或者更准确地说,通过引入有效温度来描述。

英文摘要:

The influence of out-of-plane and in-plane contact vibrations and temperature on the friction force acting on a sharp tip elastically pulled on a crystal surface is studied using a generalized Prandtl- Tomlinson model. The average friction force is significantly lowered in a frequency range determined by the "washboard" frequency of the stick-slip motion and the viscous damping accompanying the tip motion. An approximately linear relation between the actuation amplitude and the effective corrugation of the surface potential is derived in the case of in-plane actuation, extending a similar conclusion for out-of-plane actuation. Temperature causes an additional friction reduction with a scaling relation in formal agreement with the predictions of reaction rate theory in absence of contact vibrations. In this case the actuation effects can be described by the effective energy or, more accurately, by introducing an effective temperature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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