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

作     者：王苍龙 段文山 陈建敏 石玉仁 

作者机构：College of Physics and Electronic EngineeringNorthwest Normal Universityand Laboratory of Atomic and Molecular Physics in Lanzhou Institute of Modern PhysicsChinese Academy of Sciences State Key Laboratory of Solid LubricationLanzhou Institute of Chemical PhysicsChinese Academy of Sciences 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2011年第20卷第1期

页      面：426-434页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.10875098) the Natural Science Foundation of Northwest Normal University,China(Grant Nos.NWNU-KJCXGC-03-48and NWNU-KJCXGC-03-17) the Domestic Visiting Scholars Program of the Doctoral Candidates of Northwest Normal University,China 

主　　题：nanotribology Prenkel-Kontorova model phase transitions 

摘      要：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.