Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 91: Nanostructures at Surfaces: Molecular Systems I

O 91.4: Vortrag

Donnerstag, 23. März 2017, 11:15–11:30, REC/PHY C213

Electric-field effect on the formation of single-molecule contacts — •Jonathan Brand, Nicolas Néel, and Jörg Kröger — Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau

Pristine and C60-terminated tips of an atomic force microscope are used to form contacts to single C60 molecules adsorbed on Pb(111) and Cu(111). A pronounced variation of the point of contact with the electric potential difference across the junction is inferred from bias-dependent force spectroscopy. The conventional approach to describing forces in atom-scaled junctions by a superposition of van der Waals, electrostatic, and Lennard-Jones forces with a rigid junction geometry fails. Rather, the experimental observations may be rationalized by considering voltage-dependent relaxations of the electrodes.

Financial support by the Deutsche Forschungsgemeinschaft through Grant No. KR 2912/10-1 is acknowledged.

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