title: Switching between one and two dimensions: conductivity of Pb-induced chain structures on Si(557).
abstract: We show in a combined study of four-point conductance measurement and tunneling microscopy that surface state conductance induced by one monolayer of Pb on Si(557) can be quasi one dimensional with conductivity values close to typical three-dimensional metals. At a critical temperature of Tc = 78 K, associated with an order-disorder phase transition and a tenfold superperiodicity along the Pb chains, the system switches from low to high conductance anisotropy, with a semiconductor-insulator transition in the direction perpendicular to the chain structure, while along the chains conductance with a (1/T + const) temperature dependence was found.
authors.affiliation: Institut für Festkörperphysik, Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Tegenkamp
authors.forename: Z
authors.initials: Z
authors.lastname: Kallassy
authors.forename: H
authors.initials: H
authors.lastname: Pfnür
authors.forename: H-L
authors.initials: HL
authors.lastname: Günter
authors.forename: V
authors.initials: V
authors.lastname: Zielasek
authors.forename: M
authors.initials: M
authors.lastname: Henzler