We extend the study of velocity quantization phenomena recently found in the classical motion of an idealized ID model solid lubricant -consisting of a harmonic chain interposed between two periodic sliding potentials [A. Vanossi, M. Manini, G. Divitini, G.E. Santoro, E.Tosatti, Phys. Rev. Lett. 97 (2006) 056101]. This quantization is due to one slider rigidly dragging the commensurate lattice of kinks that the chain forms with the other slider. In this follow-up work we consider finite-size chains rather than infinite chains. The finite-size (i) permits the development of robust velocity plateaus as a function of the lubricant stiffness, and (ii) allows an overall chain length re-adjustment which spontaneously promotes single-particle periodic oscillations. These periodic oscillations replace the quasiperiodic motion produced by general incommensurate periods of the sliders and the lubricant in the infinite-size model. Possible consequences of these results for some real systems are discussed.
Kink plateau dynamics in finite-size lubricant chains / Cesaratto, M; Manini, N; Vanossi, A; Tosatti, E; Santoro, Giuseppe Ernesto. - In: SURFACE SCIENCE. - ISSN 0039-6028. - 601:18(2007), pp. 3682-3686. [10.1016/j.susc.2007.07.009]
Kink plateau dynamics in finite-size lubricant chains
Santoro, Giuseppe Ernesto
2007-01-01
Abstract
We extend the study of velocity quantization phenomena recently found in the classical motion of an idealized ID model solid lubricant -consisting of a harmonic chain interposed between two periodic sliding potentials [A. Vanossi, M. Manini, G. Divitini, G.E. Santoro, E.Tosatti, Phys. Rev. Lett. 97 (2006) 056101]. This quantization is due to one slider rigidly dragging the commensurate lattice of kinks that the chain forms with the other slider. In this follow-up work we consider finite-size chains rather than infinite chains. The finite-size (i) permits the development of robust velocity plateaus as a function of the lubricant stiffness, and (ii) allows an overall chain length re-adjustment which spontaneously promotes single-particle periodic oscillations. These periodic oscillations replace the quasiperiodic motion produced by general incommensurate periods of the sliders and the lubricant in the infinite-size model. Possible consequences of these results for some real systems are discussed.File | Dimensione | Formato | |
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