横向位移对润滑剂的量化速度状态的作用
Role of transverse displacements for a quantized-velocity state of the lubricant
摘要：
在一维Frenkel-Kontorova模型的理想化方案中，发现了限制在两个周期性层之间的固体润滑剂的特殊“量化”滑动状态[PRL 97，056101（2006）]。这种状态的特征在于平均润滑剂漂移速度<v_cm>和外部施加的平移速度v_ext的非平凡的几何固定比率，被理解为由于扭结（或孤子）而形成，所述扭结（或孤子）由润滑剂由于与其中一个基板的不相容性而形成，钉扎到另一个滑动基板。一个量子化的滑动状态相同的性质在这里证明了一个基本上不太理想化的2维模型，其中原子被允许垂直于滑动方向移动，并通过Lennard-Jones势相互作用。在有限温度下的量化滑动提供了明确的证据，即使与一个封闭的固体润滑剂组成的多个（多达6个）润滑剂层。在这个更真实的背景下，还显示了由“抗扭结”的存在产生的特征向后润滑剂运动。
英文摘要：
Within the idealized scheme of a 1-dimensional Frenkel-Kontorova-like model, a special "quantized" sliding state was found for a solid lubricant confined between two periodic layers [PRL 97, 056101 (2006)]. This state, characterized by a nontrivial geometrically fixed ratio of the mean lubricant drift velocity <v_cm> and the externally imposed translational velocity v_ext, was understood as due to the kinks (or solitons), formed by the lubricant due to incommensuracy with one of the substrates, pinning to the other sliding substrate. A quantized sliding state of the same nature is demonstrated here for a substantially less idealized 2-dimensional model, where atoms are allowed to move perpendicularly to the sliding direction and interact via Lennard-Jones potentials. Clear evidence for quantized sliding at finite temperature is provided, even with a confined solid lubricant composed of multiple (up to 6) lubricant layers. Characteristic backward lubricant motion produced by the presence of "anti-kinks" is also shown in this more realistic context.
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