title: Spatially resolved manipulation of single electrons in quantum dots using a scanned probe.
abstract: The scanning metallic tip of a scanning force microscope was coupled capacitively to electrons confined in a lithographically defined gate-tunable quantum dot at a temperature of 300 mK. Single electrons were made to hop on or off the dot by moving the tip or by changing the tip bias voltage owing to the Coulomb-blockade effect. Spatial images of conductance resonances map the interaction potential between the tip and individual electronic quantum dot states. Under certain conditions this interaction is found to contain a tip-voltage induced and a tip-voltage-independent contribution.
authors.affiliation: Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Pioda
authors.forename: S
authors.initials: S
authors.lastname: Kicin
authors.forename: T
authors.initials: T
authors.lastname: Ihn
authors.forename: M
authors.initials: M
authors.lastname: Sigrist
authors.forename: A
authors.initials: A
authors.lastname: Fuhrer
authors.forename: K
authors.initials: K
authors.lastname: Ensslin
authors.forename: A
authors.initials: A
authors.lastname: Weichselbaum
authors.forename: S E
authors.initials: SE
authors.lastname: Ulloa
authors.forename: M
authors.initials: M
authors.lastname: Reinwald
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider