Berlin 2005 – scientific programme
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O: Oberflächenphysik
O 10: Adsorption an Oberfl
ächen I
O 10.4: Talk
Friday, March 4, 2005, 16:30–16:45, TU EB301
Electronic interaction between a single molecular wire and a metallic nanostructure — •Leonhard Grill1, Francesca Moresco1, Ping Jiang2, Sladjana Stojkovic2, Christian Joachim2, Andre Gourdon2, and Karl-Heinz Rieder1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Nanoscience Group, CEMES-CNRS, 29 rue J.Marvig, 31055 Toulouse, France
We have studied organic so-called Lander molecules with low temperature STM. On Cu(110) these molecules act as templates for the formation of characteristic copper nanostructures, two atoms wide and seven atoms long. By manipulation with the STM tip the molecules can be shifted laterally along these nanostructures where they adapt to various stable conformations. The characterization and control of the electronic contact between a molecule and an electrode is of fundamental importance for future molecular electronics. In the present work an electronic contact, i.e. additional contribution to the tunneling current, between the molecular board and the metal atoms is observed, in particular if the Lander is brought to the end of the copper nanostructure by STM manipulation. We have studied the dependence of this electronic interaction on the molecular position and conformation, the height of the molecular wire and the chemical properties of its end group. Experimentally determined results are compared with calculations.