Models of Wearless Friction at the Atomic Scale

In order to gain a fundermental understanding of friction, many efforts have been made on wearless interfacial friction between two clean and atomically flat surfaces. Two simple theoretical models are reviewed in this concern. Thus the nonlinear static and dynamical properties of Frenkel Kontorova (FK) model presenting more complexities of wearless friction are discussed. In FK model,the static properties strongly depend on the commensurability of the lattice constants of the surfaces, and the kinetic properties are divided into perodic, quasi perodic and chaotic solutions.