Dresden 2009 – scientific programme
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O: Fachverband Oberflächenphysik
O 11: Metal substrates: Adsorption of organic / bio molecules II
O 11.7: Talk
Monday, March 23, 2009, 16:30–16:45, SCH A118
Inelastic electron tunneling spectroscopy in single C60 junctions: the role of energy level alignment — •Katharina J. Franke, Gunnar Schulze, and Jose Ignacio Pascual — Freie Universität Berlin, Berlin, Germany
Inelastic scattering of electrons has important implications in transport through single molecule junctions as it leads to heating effects [1]. Here, we measure the inelastic tunneling spectra (IETS) of C60 molecules adsorbed on different metal surfaces in order to identify the molecular vibrations playing a role in transport close to the Fermi level. We find that the alignment of the lowest unoccupied molecular orbital (LUMO) has an important effect on the detection of molecular vibrations. When the LUMO exhibits a small tail crossing the metal’s Fermi level, we are able to observe all eight Hg modes, exhibiting a strong coupling to the LUMO. The inelastic signal is further analyzed along the transition from the tunneling to the contact regime.
[1] G. Schulze, et al., Phys. Rev. Lett. 100, 136801 (2008)