Chapter 5 - Atomic-scale investigations of ultralow friction on crystal surfaces in ultrahigh vacuum

Gnecco, Enrico and Pawlak, Rémy and Glatzel, Thilo and Meyer, Ernst. (2021) Chapter 5 - Atomic-scale investigations of ultralow friction on crystal surfaces in ultrahigh vacuum. In: Superlubricity. Amsterdam, pp. 71-84.

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Controlling friction on the nanometer scale is one of nowaday challenges for scientists and engineers. Since the first observation of atomic friction reported by Mate et al. for a tungsten tip sliding on graphite, a lot of progress has been made in the understanding of this phenomenon on the atomic scale. An accurate description of the motion of a sharp tip elastically driven on a crystal surface by a microcantilever was first given by Tomanek et al., who based their interpretation on the Prandt-Tomlinson model. The lateral (friction) force acting on the tip can be estimated by measuring the angle of torsion of the cantilever. The tip sticks to a given equilibrium position on the surface lattice until the driving force becomes high enough to cause a slip into the closest equilibrium position along the pull direction. The resulting stick-slip motion corresponds to a sawtooth-shaped time evolution of the lateral force with the atomic periodicity of the surface lattice. However, this scenario is observed only if a precise condition is fulfilled. The lateral stiffness of the driving spring must be lower than the curvature of the tip-surface interaction potential. If this is not the case, the tip slides on the surface without abrupt jumps, and a superlubricity� scenario is observed.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Glatzel, Thilo and Meyer, Ernst and Pawlak, Rémy
Item Type:Book Section, refereed
Book Section Subtype:Further Contribution in a Book
Note:Publication type according to Uni Basel Research Database: Book item
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Last Modified:24 May 2023 07:27
Deposited On:24 May 2023 07:27

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