Anisotropic character of atoms in a two-dimensional Frenkel-Kontorova model

• Published in: Chinese physics B Vol. 20; no. 1; pp. 426 - 434
• Main Author: 王苍龙 段文山 陈建敏 石玉仁
• Format: Journal Article
• Language: English
• Published: IOP Publishing 2011
• Subjects: 原子运动; 各向异性; 弗兰克; 摩擦学行为; 正方晶格
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/20/1/014601

The dynamics of a certain density of interacting atoms arranged on a two-dimensional square lattice, which is made to slide over a two-dimensional periodic substrate potential with also the quare lattice symmetry, in the presence of dissipation, by an externally applied driving force, is studied. By rotating the misfit angle θ, the dynamical behaviour displays two different tribological regimes： one is smooth, the other becomes intermittent. We comment both on the nature of the atomic dynamics in the locked-to-sliding transition, and on the dynamical states displayed during the atom motion at different values of the driving force. In tribological applications, we also investigate how the main model parameters such as the stiffness strength and the magnitude of the adhesive force affect the static friction of the system. In particular, our simulation indicates that the superlubricity will appear.