Asymmetric frictional sliding between incommensurate surfaces (Articolo in rivista)

Type
Label
  • Asymmetric frictional sliding between incommensurate surfaces (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Santoro, GE; Vanossi, A; Manini, N; Divitini, G; Tosatti, E (2006)
    Asymmetric frictional sliding between incommensurate surfaces
    in Surface science
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Santoro, GE; Vanossi, A; Manini, N; Divitini, G; Tosatti, E (literal)
Pagina inizio
  • 2726 (literal)
Pagina fine
  • 2729 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 600 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Scuola Int Super Studi Avanzati, I-34014 Trieste, Italy; INFM, CNR, Democritos Natl Simulat Ctr, I-34014 Trieste, Italy; Int Ctr Theoret Phys, I-34014 Trieste, Italy; Univ Modena, CNR, INFM, Natl Res Ctr, I-41100 Modena, Italy; Univ Modena, Dept Phys, I-41100 Modena, Italy; Univ Milan, Dept Phys, I-20133 Milan, Italy (literal)
Titolo
  • Asymmetric frictional sliding between incommensurate surfaces (literal)
Abstract
  • We study the frictional sliding of two ideally incommensurate surfaces with a third incommensurate sheet - a sort of extended lubricant - in between. When the mutual ratios of the three periodicities in this sandwich geometry are chosen to be the golden mean phi = (1 + root 5)/2, this system is believed to be statically pinned for any choice of system parameters. In the present study we overcome this pinning and force the two 'substrates' to slide with a mutual velocity V-ext, analyzing the resulting frictional dynamics. An unexpected feature is an asymmetry of the relative sliding velocity of the intermediate lubricating sheet relative to the two substrates. Strikingly, the velocity asymmetry takes an exactly quantized value which is uniquely determined by the incommensurability ratio, and absolutely insensitive to all other parameters. The reason for quantization of the velocity asymmetry will be addressed. This behavior is compared and contrasted to the corresponding one obtained for a representative cubic irrational, the spiral mean omega. (c) 2006 Elsevier B.V. All rights reserved. (literal)
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