Data di Pubblicazione:
2013
Citazione:
Influence of substrate potential shape on the dynamics of a sliding lubricant chain / R.L. Woulache, A. Vanossi, N. Manini. - In: PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS. - ISSN 1539-3755. - 88:1(2013 Jul), pp. 012810.1-012810.6.
Abstract:
We investigate the frictional sliding of an incommensurate chain of
interacting particles confined in between two nonlinear on-site
substrate potential profiles in relative motion. We focus here on the
class of Remoissenet-Peyrard parametrized potentials V_RP(x, s), whose
shape can be varied continuously as a function of s, recovering the
sine-Gordon potential as a particular case. The observed frictional
dynamics of the system, crucially dependent on the mutual ratios of the
three periodicities in the sandwich geometry, turns out to be
significantly influenced also by the shape of the substrate potential.
Specifically, variations of the shape parameter s affect significantly
and not trivially the existence and robustness of the recently reported
velocity quantization phenomena [A. Vanossi et al., Phys. Rev. Lett.
97, 056101 (2006)], where the chain center-of-mass velocity to the
externally imposed relative velocity of the sliders stays pinned to
exact ``plateau'' values for wide ranges of the dynamical parameters.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
R.L. Woulache, A. Vanossi, N. Manini
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