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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Ramos, J. A. P. [1, 2] ; Granato, E. [3, 1] ; Ying, S. C. [3] ; Achim, C. V. [4, 5, 6] ; Elder, K. R. [7] ; Ala-Nissila, T. [3, 4, 5]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Inst Nacl Pesquisas Espaciais, Lab Associado Sensores & Mat, BR-12245970 Sao Jose Dos Campos, SP - Brazil
[2] Univ Estadual Sudoeste Bahia, Dept Ciencias Exatas, BR-45000000 Vitoria De Conquista, BA - Brazil
[3] Brown Univ, Dept Phys, Providence, RI 02912 - USA
[4] Aalto Univ, Dept Appl Phys, FI-02015 Espoo - Finland
[5] Aalto Univ, COMP Ctr Excellence, FI-02015 Espoo - Finland
[6] Univ Dusseldorf, Inst Theoret Phys Weiche Mat 2, D-40225 Dusseldorf - Germany
[7] Oakland Univ, Dept Phys, Rochester, MI 48309 - USA
Número total de Afiliações: 7
Tipo de documento: Artigo Científico
Fonte: Physical Review E; v. 81, n. 1, 1 JAN 2010.
Citações Web of Science: 32
Resumo

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. (AU)

Processo FAPESP: 07/08492-9 - Dinâmica, defeitos topológicos e transições de fase em meios ordenados
Beneficiário:Enzo Granato
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 09/01942-4 - See Chen Ying | Brown University - Estados Unidos
Beneficiário:Enzo Granato
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional