title: Shifting the Voltage Drop in Electron Transport Through a Single Molecule.
abstract: A Mn-porphyrin was contacted on Au(111) in a low-temperature scanning tunneling microscope (STM). Differential conductance spectra show a zero-bias resonance that is due to an underscreened Kondo effect according to many-body calculations. When the Mn center is contacted by the STM tip, the spectrum appears to invert along the voltage axis. A drastic change in the electrostatic potential of the molecule involving a small geometric relaxation is found to cause this observation.
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.
authors.forename: Sujoy
authors.initials: S
authors.lastname: Karan
authors.affiliation: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany.
authors.forename: David
authors.initials: D
authors.lastname: Jacob
authors.affiliation: Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Karolak
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Hamann
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Weismann
authors.affiliation: I. Institut für Theoretische Physik, Universität Hamburg, 20355 Hamburg, Germany.
authors.forename: Alexander I
authors.initials: AI
authors.lastname: Lichtenstein
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.
authors.forename: Richard
authors.initials: R
authors.lastname: Berndt