Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 74: Organic Molecules at Surfaces 5: Molecular Switches
O 74.6: Talk
Thursday, September 8, 2022, 16:15–16:30, S054
Electronic Motor Based on Single Tripodal Chiral Molecule — Julian Skolaut1, •Lukas Gerhard1, Nico Balzer2, Michal Valasek2, Jan Wilhelm4, Philipp Markus5, Marcel Mayor2,3, Ferdinand Evers4, and Wulf Wulfhekel1,5 — 1Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Eggenstein- Leopoldshafen, Germany — 2Institute of Nanotechnology, KIT, Eggenstein-Leopoldshafen, Germany — 3Department of Chemistry, University Basel, Basel, Switzerland — 4Institute of Theoretical Physics, University of Regensburg, Regensburg, Germany — 5Physikalisches Institut, KIT, Karlsruhe, Germany
We present our results concerning a single molecular motor driven by the current in an STM. Three anchoring groups fix the molecules to a Au(111) surface. In specific ordered structures, the molecules adsorb such, that the protruding head group is free to rotate. This chiral group is supposed to perform a rotation in a preferred direction, proposed to be driven based on the chiral-induced spin selectivity (CISS) effect. At fixed tip positions above the molecules, three distinguishable current levels can be observed. These are interpreted as metastable rotational states. That way, two rotation directions can be defined. Via binomial tests, we verify that the surplus of rotational switches in one direction compared to the other is statistically significant. In voltage and current dependent measurements, two interesting trends are observed. Firstly, the rate of events decreases with increasing current. Secondly, the asymmetry in the switching events shows non-monotonic behavior, depending on the voltage.