Nonlinear response and dynamical transitions in a phase-field crystal model for adsorbed overlayers

The nonlinear response and sliding friction behavior of a phase-field crystal model for driven adsorbed atomic layers is determined numerically. The model describes the layer as a continuous density field coupled to the pinning potential of the substrate and under an external driving force. Dynamica...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-09, Vol.246 (1), p.012024
Main Authors: Ramos, J A P, Granato, E, Ying, S C, Achim, C V, Elder, K R, Ala-Nissila, T
Format: Article
Language:English
Subjects:
Freezing
Low temperature
Mathematical models
Molecular dynamics
Nonlinear response
Physics
Sliding friction
Substrates
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Summary:The nonlinear response and sliding friction behavior of a phase-field crystal model for driven adsorbed atomic layers is determined numerically. The model describes the layer as a continuous density field coupled to the pinning potential of the substrate and under an external driving force. Dynamical equations which take into account both thermal fluctuations and inertial effects are used for numerical simulations of commensurate and incommensurate layers. At low temperatures, the velocity response of an initially commensurate layer shows hysteresis with dynamical melting and freezing transitions at different critical forces. The main features of the sliding friction behavior are similar to the results obtained previously from molecular dynamics simulations of particle models. However, the dynamical transitions correspond to nucleations of stripes rather than closed domains.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/246/1/012024