title: Graphene on Ru(0001): contact formation and chemical reactivity on the atomic scale.
abstract: Graphene on Ru(0001) is contacted with Au tips of a cryogenic scanning tunneling microscope. The formation and conductance of single-atom contacts vary within the moiré unit cell. Density functional calculations reveal that elastic distortions of the graphene lattice occur at contact due to a selectively enhanced chemical reactivity of C atoms at hollow sites of Ru(0001). Concomitant quantum transport calculations indicate that the graphene-Ru distance determines the conductance variations.
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany. altenburg@physik.uni-kiel.de
authors.forename: S J
authors.initials: SJ
authors.lastname: Altenburg
authors.forename: J
authors.initials: J
authors.lastname: Kröger
authors.forename: B
authors.initials: B
authors.lastname: Wang
authors.forename: M-L
authors.initials: ML
authors.lastname: Bocquet
authors.forename: N
authors.initials: N
authors.lastname: Lorente
authors.forename: R
authors.initials: R
authors.lastname: Berndt