SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 5: Poster Session I: Metal substrates I
O 5.6: Poster
Montag, 1. März 2021, 10:30–12:30, P
Moving azulene based molecules by STM: The role of dipole moment and field effect — •Tim Kühne1,2, Kwan Ho Au Yeung1,2, Frank Eisenhut1,2, Oumaima Aiboudi3, Dmitry Ryndyk2, Gianaurelio Cuniberti2, Franziska Lissel3, and Francesca Moresco1 — 1Center for Advancing Electronics Dresden, TU Dresden, 01062 Dresden, Germany — 2Institute for Materials Science, TU Dresden, 01062 Dresden, Germany — 3Leibniz Institute of Polymer Research, 01069 Dresden, Germany
Among the different mechanisms that can be used to drive a molecule on a surface by the tip of a scanning tunneling microscope at low temperature, we used voltage pulses to move azulene-based single molecules and nanostructures on Au(111). Upon evaporation, the molecules partially cleave and form metallo-organic dimers while single molecules are very scarce, as confirmed by simulations. By applying voltage pulses to the different structures in similar conditions, we observe that only one type of dimers can be controllably driven on the surface. This has the lowest dipole moment of all investigated structures. Experiments at different bias and tip height conditions reveal that the electric field is the main driving force of the directed motion. We discuss the different observed structures and their movement properties with respect to their dipole moment and charge distribution on the surface.