原子尺度摩擦中的横向振动效应
Lateral vibration effects in atomic-scale friction
摘要：
利用原子力显微镜（AFM）在超高真空NaCl（001）表面上的测量，研究了横向振动对纳米针尖在平面晶体表面上的粘滑运动的影响.纳米尖端在晶格上的滑动预计在增加的驱动振幅，类似于在正常振动的存在下观察到的。这降低了平均摩擦力，正如在有限温度下叠加横向振动的普朗特-汤姆林森模型所解释的那样。然而，横向力的峰值和总能量损失预计会随着激励幅度的增加而增加，这可能会限制这种效应的实际相关性。
英文摘要：
The influence of lateral vibrations on the stick-slip motion of a nanotip elastically pulled on a flat crystal surface is studied by atomic force microscopy (AFM) measurements on a NaCl(001) surface in ultra-high vacuum. The slippage of the nanotip across the crystal lattice is anticipated at increasing driving amplitude, similarly to what is observed in presence of normal vibrations. This lowers the average friction force, as explained by the Prandtl-Tomlinson model with lateral vibrations superimposed at finite temperature. Nevertheless, the peak values of the lateral force, and the total energy losses, are expected to increase with the excitation amplitude, which may limit the practical relevance of this effect.
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