title: Voltage-dependent conductance states of a single-molecule junction.
abstract: Ag-Sn-phthalocyanine-Ag  junctions are shown to exhibit three conductance states. While the junctions are conductive at low bias, their impedance drastically increases above a critical bias. Two-level fluctuations occur at intermediate bias. These characteristics may be used to protect a nanoscale circuit. Further experiments along with calculations reveal that the self-limiting conductance of the junctions is due to reversible changes of the junction geometry.
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, D-24098 Kiel, Germany. yfwang@physik.uni-kiel.de
authors.forename: Y F
authors.initials: YF
authors.lastname: Wang
authors.forename: N
authors.initials: N
authors.lastname: Néel
authors.forename: J
authors.initials: J
authors.lastname: Kröger
authors.forename: H
authors.initials: H
authors.lastname: Vázquez
authors.forename: M
authors.initials: M
authors.lastname: Brandbyge
authors.forename: B
authors.initials: B
authors.lastname: Wang
authors.forename: R
authors.initials: R
authors.lastname: Berndt