title: The backside of graphene: manipulating adsorption by intercalation.
abstract: The ease by which graphene is affected through contact with other materials is one of its unique features and defines an integral part of its potential for applications. Here, it will be demonstrated that intercalation, the insertion of atomic layers in between the backside of graphene and the supporting substrate, is an efficient tool to change its interaction with the environment on the frontside. By partial intercalation of graphene on Ir(111) with Eu or Cs we induce strongly n-doped graphene patches through the contact with these intercalants. They coexist with nonintercalated, slightly p-doped graphene patches. We employ these backside doping patterns to directly visualize doping induced binding energy differences of ionic adsorbates to graphene through low-temperature scanning tunneling microscopy. Density functional theory confirms these binding energy differences and shows that they are related to the graphene doping level.
authors.affiliation: II. Physikalisches Institut , Universität zu Köln , Zülpicher Straße 77, 50937 Köln, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Schumacher
authors.forename: Tim O
authors.initials: TO
authors.lastname: Wehling
authors.forename: Predrag
authors.initials: P
authors.lastname: Lazić
authors.forename: Sven
authors.initials: S
authors.lastname: Runte
authors.forename: Daniel F
authors.initials: DF
authors.lastname: Förster
authors.forename: Carsten
authors.initials: C
authors.lastname: Busse
authors.forename: Marin
authors.initials: M
authors.lastname: Petrović
authors.forename: Marko
authors.initials: M
authors.lastname: Kralj
authors.forename: Stefan
authors.initials: S
authors.lastname: Blügel
authors.forename: Nicolae
authors.initials: N
authors.lastname: Atodiresei
authors.forename: Vasile
authors.initials: V
authors.lastname: Caciuc
authors.forename: Thomas
authors.initials: T
authors.lastname: Michely