title: Charge Puddles in Graphene near the Dirac Point.
abstract: The charge carrier density in graphene on a dielectric substrate such as SiO_{2} displays inhomogeneities, the so-called charge puddles. Because of the linear dispersion relation in monolayer graphene, the puddles are predicted to grow near charge neutrality, a markedly distinct property from conventional two-dimensional electron gases. By performing scanning tunneling microscopy and spectroscopy on a mesoscopic graphene device, we directly observe the puddles' growth, both in spatial extent and in amplitude, as the Fermi level approaches the Dirac point. Self-consistent screening theory provides a unified description of both the macroscopic transport properties and the microscopically observed charge disorder.
authors.affiliation: Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France.|CNRS, Institut NEEL, F-38042 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Samaddar
authors.affiliation: Centre for Advanced 2D Materials and Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore.
authors.forename: I
authors.initials: I
authors.lastname: Yudhistira
authors.affiliation: Centre for Advanced 2D Materials and Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore.|Yale-NUS College, 16 College Avenue West, Singapore 138527, Singapore.
authors.forename: S
authors.initials: S
authors.lastname: Adam
authors.affiliation: Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France.|CNRS, Institut NEEL, F-38042 Grenoble, France.
authors.forename: H
authors.initials: H
authors.lastname: Courtois
authors.affiliation: Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France.|CNRS, Institut NEEL, F-38042 Grenoble, France.
authors.forename: C B
authors.initials: CB
authors.lastname: Winkelmann