Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 95: Other And Miscellaneous
O 95.2: Vortrag
Donnerstag, 15. März 2018, 12:15–12:30, MA 144
Conductance of a Freestanding Conjungated Wire — •Torben Jasper-Tönnies1, Aran Garcia-Lekue2, 3, Thomas Frederiksen2, 3, Sandra Ulrich4, Rainer Herges4, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany — 2Donostia International Physics Center, Paseo Manuel de Lardizabal 4, Donostia-San Sebastián, Spain — 3IKERBASQUE, Basque Foundation for Science, Bilbao, Spain — 4Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität, 24098 Kiel, Germany
A free-standing molecular wire is placed vertically on Au(111) using a platform molecule and contacted by a scanning tunneling microscope. Despite the simplicity of the single-molecule junction its conductance G reproducibly varies in a complex manner with the electrode separation. Transport calculations show that G is controlled by a deformation of the molecule, a symmetry mismatch between the tip and molecule orbitals, and the breaking of a C≡C triple in favor of a Au–C bond. This tip-controlled reversible bond formation and rupture alters the electronic spectrum of the junction and the states accessible for transport, resulting in an order of magnitude variation of the conductance. Financial support by the Deutsche Forschungsgemeinschaft (SFB 677) and the Basque Department of Education (PI-2016-1-0027) is gratefully acknowledged.