title: Scanning Quantum Dot Microscopy.
abstract: We introduce a scanning probe technique that enables three-dimensional imaging of local electrostatic potential fields with subnanometer resolution. Registering single electron charging events of a molecular quantum dot attached to the tip of an atomic force microscope operated at 5 K, equipped with a qPlus tuning fork, we image the quadrupole field of a single molecule. To demonstrate quantitative measurements, we investigate the dipole field of a single metal adatom adsorbed on a metal surface. We show that because of its high sensitivity the technique can probe electrostatic potentials at large distances from their sources, which should allow for the imaging of samples with increased surface roughness.
authors.affiliation: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Wagner
authors.affiliation: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors.forename: Matthew F B
authors.initials: MF
authors.lastname: Green
authors.affiliation: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Leinen
authors.affiliation: Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany.
authors.forename: Thorsten
authors.initials: T
authors.lastname: Deilmann
authors.affiliation: Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Krüger
authors.affiliation: Institut für Festkörpertheorie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Rohlfing
authors.affiliation: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors.forename: Ruslan
authors.initials: R
authors.lastname: Temirov
authors.affiliation: Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany.|Jülich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Jülich, Germany.
authors.forename: F Stefan
authors.initials: FS
authors.lastname: Tautz