Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Focus Session: Functional Molecules at Surfaces II

O 41.1: Vortrag

Dienstag, 17. März 2020, 10:30–10:45, TRE Ma

Tip-induced inversion of the chirality of a molecule’s adsorption potential probed by the switching directionalityAnja Bauer1, Markus Maier2, Werner Schosser1,3, Josefine Diegel1, Fabian Paschke1, Yuriy Dedkov4, Fabian Pauly3,1, Rainer F. Winter2, and •Mikhail Fonin11Department of Physics, University of Konstanz, 78457 Konstanz, Germany — 2Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany — 3Okinawa Institute of Science and Technology Graduate University, Onna-son, Okinawa 904-0495, Japan — 4Department of Physics, Shanghai University, 99 Shangda Road, 200444 Shanghai, China

The switching behaviour of surface-supported molecular units is determined by the shape of the adsorption potential. Here, by means of scanning tunneling microscopy, we study a triazatruxene (TAT) molecule on Ag(111), which shows a switching behavior characterized by transitions of the molecule between three states, and which we attribute to three energetically degenerate bonding configurations. Upon tunneling current injection the system can be excited, showing a pronounced switching directionality. Two surface enantiomers of TAT show opposite switching directions pointing at the chirality of the energy landscape of the adsorption potential as a key indigent for directional switching. Further we show that by modifying the tunneling parameters, the symmetry of the adsorption potential can be controlled, leading to a suppression of the directionality or an inversion of the switching direction.

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