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O: Fachverband Oberflächenphysik

O 74: Nanostructures at surfaces: Other

O 74.9: Vortrag

Donnerstag, 25. März 2010, 17:00–17:15, H34

Transport properties of single atom and single molecule junctions — •Guillaume Schull — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — Institut de Physique et de Chimie de Strasbourg, Université Louis Pasteur, CNRS UMR 7504, 67034 Strasbourg, France.

The study of the current passing through single atoms or molecules has revealed fascinating phenomena such as the observation of a quantization of the conductance or a reduction of the shot noise at single atom contacts... A next step is to determine how transport properties of atoms and molecules are influenced by the contacts geometry. We used a scanning tunneling microscope (STM) which provides a way to precisely localize and characterize the structures of interest before probing their transport properties. First, I will focus on the transport properties of single C60 molecules and show how atomic scale variations of the molecule-metal interfaces influence the junction conductance. Using a STM tip with a C60 attached at the apex, the transport properties of a suspended chain made of two C60 have been probed. Here, the molecule-molecule interface is revealed to be the limiting factor to the contact conductance. Finally, I will show that specific inelastic contributions to the current (under tunnelling and contact conditions) can be probed by studying the light emitted at the STM junction.

These works were performed in collaboration with Thomas Frederiksen, Michael Becker, Nicolas Néel, Peter Johansson, Mads Brandbyge and Richard Berndt.