Atomic Friction Investigations on Ordered Superstructures |
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Authors: | Pascal Steiner Enrico Gnecco Tobin Filleter Nitya Nand Gosvami Sabine Maier Ernst Meyer Roland Bennewitz |
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Affiliation: | 1.Department of Physics,University of Basel,Basel,Switzerland;2.Department of Physics,McGill University,Montreal,Canada;3.INM, Leibniz Institute for New Materials,Saarbrücken,Germany;4.Materials Science Division,Lawrence Berkeley National Laboratory,Berkeley,USA |
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Abstract: | We review recent friction measurements on ordered superstructures performed by atomic force microscopy. In particular, we
consider ultrathin KBr films on NaCl(001) and Cu(001) surfaces, single and bilayer graphene on SiC(0001), and the herringbone
reconstruction of Au(111). Atomically resolved friction images of these systems show periodic features spanning across several
unit cells. Although the physical mechanisms responsible for the formation of these superstructures are quite different, the
experimental results can be interpreted within the same phenomenological framework. A comparison between experiments and modeling
shows that, in the cases of KBr films on NaCl(001) and of graphene films, the tip-surface interaction is well described by
a potential with the periodicity of the substrate which is modulated or, respectively, superimposed with a potential with
the symmetry of the superstructure. |
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