Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 28: Organic Molecules on Inorganic Substrates I: Switching and Manipulation

O 28.1: Vortrag

Dienstag, 2. April 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 Dedkov^1,3, 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.