Dynamical transitions and sliding friction of the phase-field-crystal model with pinning

J.A.P. Ramos, E. Granato, S.C. Ying, C.V. Achim, Ken Elder, T. Ala-Nissilä

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)
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Abstract

We study the nonlinear driven response and sliding friction behavior of the phase-field-crystal (PFC) model with pinning including both thermal fluctuations and inertial effects. The model provides a continuous description of adsorbed layers on a substrate under the action of an external driving force at finite temperatures, allowing for both elastic and plastic deformations. We derive general stochastic dynamical equations for the particle and momentum densities including both thermal fluctuations and inertial effects. The resulting coupled equations for the PFC model are studied numerically. At sufficiently low temperatures, we find that the velocity response of an initially pinned commensurate layer shows hysteresis with dynamical melting and freezing transitions for increasing and decreasing applied forces at different critical values. The main features of the nonlinear response in the PFC model are similar to the results obtained previously with molecular dynamics simulations of particle models for adsorbed layers.
Original languageEnglish
Article number011121
Pages (from-to)1-7
JournalPhysical Review E
Volume81
Issue number1
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Keywords

  • adsorbed layers sliding
  • phase field crystal model

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