Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Organic/bio Molecules on Metal Surfaces I
O 6.8: Vortrag
Montag, 31. März 2014, 12:15–12:30, TRE Phy
Charge switching in a self-assembled acceptor-donor complex — •Paul Stoll1, Janina N. Ladenthin1, Tobias R Umbach1, Christian Lotze1, Isabel Fernandez Torrente1, Nacho Pascual2, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin — 2CIC NanoGUNE, San Sebastian
The switching mechanisms between metastable states in molecules is based on fundamental quantum physics and is potentially valuable for future applications in molecular electronics. We investigate the charge-transfer complex tetracyanoethylene (TCNE) and tetrathiafulvalene (TTF) on a Au(111) surface using low temperature scanning tunneling microscopy and spectroscopy. The molecules self-assemble in highly ordered islands with different stoichiometries. The TCNE molecules are found in two different charge states that are identified by the presence or abscence of a Kondo resonance. The rates of the random switching between these states are controlled by the tunneling current and the applied bias.