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O: Fachverband Oberflächenphysik
O 28: Organic Molecules on Inorganic Substrates I: Switching and Manipulation
O 28.1: Talk
Tuesday, April 2, 2019, 10:30–10:45, H24
Controllable three-terminal molecular switch based on adsorption site jiggling — •Anja Bauer1, Markus Maier2, Josefine Diegel1, Werner Schosser1, Fabian Paschke1, Yuriy Dedkov1,3, Fabian Pauly1, Rainer Winter2, and Mikhail Fonin1 — 1Department of Physics, University Konstanz, D-78457 Konstanz — 2Department of Chemistry, University Konstanz, D-78457 Konstanz — 3Department of Physics, Shanghai University, 200444 Shanghai, China
Realization schemes for tuning the electronic and magnetic properties as well as for the control of molecular motion on surfaces are of crucial importance for the fabrication of molecule-based functional devices. One possibility to controllably tune the properties of individual molecules relies on the atomically precise manipulation of the environment.
Here, we investigate the switching behavior of single triazatruxene (TAT) molecules on Ag(111) by low temperature STM. Time-dependent current measurements reveal a current-induced telegraph noise, which is characteristic for switching between well-defined states. The pristine TAT molecule switches between three states of different adsorption geometry and orbital population. The switching rate can be efficiently controlled by the tunneling parameters. We further show the possibility to controllably initiate or suppress the switching process by detaching or attaching hydrogen to the nitrogen atoms of TAT as well as to manipulate the switching rates by modification of the molecule’s environment.