title: Local gating of an Ir(111) surface resonance by graphene islands.
abstract: The influence of graphene islands on the electronic structure of the Ir(111) surface is investigated. Scanning tunneling spectroscopy (STS) indicates the presence of a two-dimensional electron gas with a binding energy of -160  meV and an effective mass of -0.18me underneath single-layer graphene on the Ir(111) surface. Density functional calculations reveal that the STS features are predominantly due to a holelike surface resonance of the Ir(111) substrate. Nanometer-sized graphene islands act as local gates, which shift and confine the surface resonance.
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: T O
authors.initials: TO
authors.lastname: Wehling
authors.forename: B
authors.initials: B
authors.lastname: Sachs
authors.forename: A I
authors.initials: AI
authors.lastname: Lichtenstein
authors.forename: R
authors.initials: R
authors.lastname: Berndt