Conduction mechanisms in biphenyl dithiol single-molecule junctions

M. Bürkle,1,2 J. K. Viljas,3,4 D. Vonlanthen,5 A. Mishchenko,6 G. Schön,1,2,7 M. Mayor,2,5,7,* T. Wandlowski,6,† and F. Pauly1,2,8,‡ 1Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany 2Center for Functional Nanostructures, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany 3Low Temperature Laboratory, Aalto University, P.O. Box 15100, FIN-00076 AALTO, Finland 4Department of Physics, P.O. Box 3000, FIN-90014 University of Oulu, Finland 5Department of Chemistry, University of Basel, CH-4003 Basel, Switzerland 6Department of Chemistry and Biochemistry, University of Bern, CH-3012 Bern, Switzerland 7Institute of Nanotechnology, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Germany 8Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA (Received 1 September 2011; revised manuscript received 16 December 2011; published 21 February 2012)