Confined molecules under shear: from a microscopic description to phenomenology

A coarse grained two-state model is derived starting from a molecular dynamics description of a molecular system under shear. This model captures the main features of the response of a confined system under shear, and generalizes the phenomenological Tomlinson model for the response of a driven syst...

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Bibliographic Details
Published inPhysical review letters Vol. 87; no. 27 Pt 1; p. 275506
Main Authors Filippov, A E, Klafter, J, Urbakh, M
Format Journal Article
LanguageEnglish
Published United States 31.12.2001
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Summary:A coarse grained two-state model is derived starting from a molecular dynamics description of a molecular system under shear. This model captures the main features of the response of a confined system under shear, and generalizes the phenomenological Tomlinson model for the response of a driven system. The derivation is based on the solution of coupled microscopic equations using a mean field approximation. The two-state model agrees well with the direct numerical solution and offers a practical approach to investigate the response of sheared systems under a broad range of parameters.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.87.275506