Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 56: Metal substrates: Adsorption of organic / bio molecules III
O 56.4: Vortrag
Mittwoch, 28. März 2012, 17:30–17:45, A 053
Orientation-dependent electronic structure of a molecule investigated by STM and DFT with dispersion corrections — •Maya Lukas1, Karin Fink1, Kerrin Dössel1, Alexandrina Stuparu1, Christophe Stroh1, Olaf Fuhr1, Marcel Mayor1,2, and Hilbert von Löhneysen1,3 — 1Karlsruher Institut für Technologie (KIT), Institut für Nanotechnologie, D-76021 Karlsruhe — 2Universität Basel, Department of Chemistry, CH-4056 Basel — 3Karlsruher Institut für Technologie (KIT), Physikalisches Institut und Institut für Festkörperphysik, D-76021 Karlsruhe
In recent years it has become obvious that the exact orientation and bond of a molecular wire to its connecting electrodes has a crucial influence on the molecular conductance. Determining the exact bond configuration as well as the electronic properties within the same experiment is hardly ever acchieved, if possible at all.
We investigated a molecule which consists of several identical molecular wires connected in a rigid conformation. Due to the form of the molecule, some of the wires protrude freely from the surface, while others are attached to it. The influence of the coupling to the surface electrode on the position and electronic properties of the molecule is investigated by scanning tunneling microscopy and density functional theory with dispersion corrections. Within the same molecular conformation, chemically identical parts of the molecule with different orientations towards the surface show strong variations of the electronic structure in the experiment as well as in the calculations.