Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.41: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

Tunable transport by controlling the structure of an STM molecular junction — •Florian Pump¹, Michael Rohlfing², Bo Song¹, Ruslan Temirov³, Adam Lassise⁴, Olga Neucheva³, Stefan Tautz³, and Gianaurelio Cuniberti¹ — ¹Institute for Materials Science, Dresden University of Technology, D-01062 Dresden, Germany — ²Department of Physics, University of Osnabrück, D-49069 Osnabrück, Germany — ³Institute of Bio- and Nanosystems (IBN), Institute 3: Institute of Thin Films and Interfaces 3 (IBN3), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany — ⁴Jacobs University Bremen, School of Engineering and Science, D-28725 Bremen, Germany

In molecular junctions, the coupling between the electric contacts and the actual molecule is of great importance. Scanning tunneling microscopy (STM) techniques allow, in addition to their imaging possibilities at a high resolution, the option to mechanically manipulate the bonding properties between molecules and metal surfaces and provide the feasibility to subsequently measure transport effects through the molecule. Based on recent experiments studying the lifting of a single PTCDA molecule from an Ag surface, we present the results of our Density Functional Theory based calculations. We discuss the variation of the energies of the molecular levels and the device substrate coupling during the peeling process and describe its effects on the transport properties through the molecule.