Role of transverse displacements for a quantized-velocity state of the lubricant

Details Role of transverse displacements for a quantized-velocity state of the lubricant Role of transverse displacements for a quantized-velocity state of the lubricant

2008-04-09

arxiv.org/abs/0804.1519v1

Physics

Condensed Matter

Materials Science

11 pages, 9 figures

Scientific paper

10.1088/0953-8984/20/35/354005

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 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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