title: Tuning the van der Waals Interaction of Graphene with Molecules via Doping.
abstract: We use scanning tunneling microscopy to visualize and thermal desorption spectroscopy to quantitatively measure that the binding of naphthalene molecules to graphene, a case of pure van der Waals interaction, strengthens with n and weakens with p doping of graphene. Density-functional theory calculations that include the van der Waals interaction in a seamless, ab initio way accurately reproduce the observed trend in binding energies. Based on a model calculation, we propose that the van der Waals interaction is modified by changing the spatial extent of graphene's π orbitals via doping.
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany.
authors.forename: Felix
authors.initials: F
authors.lastname: Huttmann
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany.
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: Martínez-Galera
authors.affiliation: Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich, 52428 Jülich, Germany.
authors.forename: Vasile
authors.initials: V
authors.lastname: Caciuc
authors.affiliation: Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich, 52428 Jülich, Germany.
authors.forename: Nicolae
authors.initials: N
authors.lastname: Atodiresei
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Schumacher
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Standop
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA) and Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Ikutaro
authors.initials: I
authors.lastname: Hamada
authors.affiliation: Bremen Center for Computational Material Science (BCCMS), Universität Bremen, Am Fallturm 1a, 28359 Bremen, Germany.
authors.forename: Tim O
authors.initials: TO
authors.lastname: Wehling
authors.affiliation: Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich, 52428 Jülich, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Blügel
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Michely