title: Reversible optical doping of graphene.
abstract: The ultimate surface exposure provided by graphene monolayer makes it the ideal sensor platform but also exposes its intrinsic properties to any environmental perturbations. In this work, we demonstrate that the charge carrier density of graphene exfoliated on a SiO2/Si substrate can be finely and reversibly tuned between hole and electron doping with visible photons. This photo-induced doping happens under moderate laser power conditions but is significantly affected by the substrate cleaning method. In particular, it requires hydrophilic substrates and vanishes for suspended graphene. These findings suggest that optically gated graphene devices operating with a sub-second time scale can be envisioned and that Raman spectroscopy is not always as non-invasive as generally assumed.
authors.affiliation: Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095, Montpellier, France. Antoine.Tiberj@univ-montp2.fr
authors.forename: A
authors.initials: A
authors.lastname: Tiberj
authors.forename: M
authors.initials: M
authors.lastname: Rubio-Roy
authors.forename: M
authors.initials: M
authors.lastname: Paillet
authors.forename: J-R
authors.initials: JR
authors.lastname: Huntzinger
authors.forename: P
authors.initials: P
authors.lastname: Landois
authors.forename: M
authors.initials: M
authors.lastname: Mikolasek
authors.forename: S
authors.initials: S
authors.lastname: Contreras
authors.forename: J-L
authors.initials: JL
authors.lastname: Sauvajol
authors.forename: E
authors.initials: E
authors.lastname: Dujardin
authors.forename: A-A
authors.initials: AA
authors.lastname: Zahab
mesh_terms: D004579:Electron Transport / Q000528:radiation effects; D006108:Graphite / Q000737:chemistry* / Q000528:radiation effects*; D007834:Lasers; D008422:Materials Testing; D011829:Radiation Dosage; D013499:Surface Properties / Q000528:radiation effects
chemical_list: D006108:Graphite
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