title: Effects of the commensurability and disorder on friction for the system Xe/Cu.
abstract: We present molecular dynamics simulations of static friction for a monolayer of Xe deposited on a thick slab of Cu for two different geometries. The interaction potential between Xe and Cu has been derived from DFT calculations. The first geometry is the commensurate adsorption geometry (√3 × √3 suggested by LEED, corresponding to a coverage 1/3, where all Xe atoms are on top positions. The second one corresponds to a coverage 0.36 and is characterized by a large surface unit cell, containing 9 Xe atoms in different disordered positions. This large unit cell mimics an incommensurate case. Our analysis points out the effect of the order/disorder in tribological properties of a realistic three-dimensional system.
authors.affiliation: Dipartimento di Fisica, Universitá di Modena e Reggio Emilia, Modena, Italy. anna.franchini@unimore.it
authors.forename: A
authors.initials: A
authors.lastname: Franchini
authors.forename: V
authors.initials: V
authors.lastname: Bortolani
authors.forename: G
authors.initials: G
authors.lastname: Santoro
authors.forename: K
authors.initials: K
authors.lastname: Xheka