Abstract
We discuss the friction and motion of a model of a dimer with asymmetric interactions with a substrate potential. Starting from the consideration that a rigid dimer with spacing equal to half of the period of the potential has exactly zero static friction like the infinite incommensurate Frenkel Kontorova model, we show how stick-slip behaviour and friction arise as a function of asymmetry. We argue that this model can yield a simple yet insightful description of the frictional behaviour of graphene flakes on graphite and of superlubricity. The results can also be of interest for diatomic molecules on surfaces.
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Hens, R., Fasolino, A. An asymmetric dimer in a periodic potential: a minimal model for friction of graphene flakes. Eur. Phys. J. B 89, 167 (2016). https://doi.org/10.1140/epjb/e2016-70273-5
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DOI: https://doi.org/10.1140/epjb/e2016-70273-5