Local deformations and incommensurability of high-quality epitaxial graphene on a weakly interacting transition metal
Local deformations and incommensurability of high-quality epitaxial graphene on a weakly interacting transition metal
We investigate the fine structure of graphene on iridium, which is a model for graphene weakly interacting with a transition-metal substrate. Even the highest-quality epitaxial graphene displays tiny imperfections, i.e., small biaxial strains of $\ensuremath{\sim}$0.3$%$, rotations of $\ensuremath{\sim}$0.5${}^{\ensuremath{\circ}}$, and shears over distances of $\ensuremath{\sim}$100 nm, and is found incommensurate, as …