Numerical simulations of atomic-scale friction between solid surfaces

Atomic-scale frictional phenomena at solid surfaces, such as pinning and di ssipative sliding of solids, are studied theoretically and numerically. The pinning behavior at realistic solid surfaces shows the universality determ ined by the spatial dimension of the interface between solids, regardless o f the spatial dimension of solids. We find complicated sliding velocity dep endence with peak structures in the kinetic frictional force. Using a pertu rbation technique, it is understood that such velocity dependence is caused by resonance effects between two solids.