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DPG

Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)

O 35.32: Poster

Tuesday, March 12, 2013, 18:15–21:45, Poster B1

Bistable charge states in the acceptor-donor complex Tetracyanoethylene-Tetrathiafulvalene on Au(111) — •Paul Stoll1, Janina Ladentin1, Tobias R. Umbach1, Christian Lotze1, Isabel Fernandez Torrente1, José Ignacio Pascual1,2, and Katharina J. Franke11Institut für Experimentalphysik, Freie Universität Berlin — 2CIC nanoGUNE, Donostia-San Sebastián, Spain

The charge state of a molecule has a crucial influence on its physical and chemical properties. Using scanning tunneling microscopy and spectroscopy we investigate the charge-transfer complex consisting of Tetracyanoethylene (TCNE) and Tetrathiafulvalene (TTF) on a Au(111) surface. The two molecules self-assemble in highly ordered mixed islands. The TCNE molecules are found in two different charge states that are identified by the presence or abscence of a Kondo resonance. We observe a current-induced bistability of the two states. The switching yield strongly depends on the bias voltage and varies by orders of magnitude.

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