Definition of nano-scale contact by Moiré corrugation of twisted bilayer graphene and its effect on nano-scale friction

Abstract

Adhesion theory explains that friction is caused by shearing real contact area at microscale. On the other hands, the effect of crystal orientation appears as anisotropy of nanoscale friction, which means the breakdown of macroscale adhesion theory at nanoscale. In this study, we define nanoscale contact at twisted graphene interface using Moiré pattern reflecting stacking structure, and we also attempt to understand the effect of the nanoscale contact on nanoscale friction.