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O: Fachverband Oberflächenphysik
O 63: Focus Session: Functional Molecules at Surfaces III
O 63.11: Vortrag
Mittwoch, 18. März 2020, 13:15–13:30, TRE Ma
Controlling orientation, rotation, and translation of a single molecule by STM via an internal electrical dipole — •Grant J Simpson1, Víctor García-López2, A Daniel Boese3, James M Tour2, and Leonhard Grill1 — 1Department of Physical Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria — 2Departments of Chemistry and Material Science and NanoEngineering, and the Smalley-Curl Institute and NanoCarbon Centre, Rice University, Houston, TX 77005, USA — 3Department of Theoretical Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria
Controlling matter at the individual atom and molecule scale gives insight into basic physical and chemical properties which underpin the field of nanoscience. An interesting approach to controlling molecular mobility on a surface is to implement a strong dipole moment in a molecule which can then interact with the electric field of the tunnel junction. We have used a scanning tunnelling microscope (STM) running at low temperatures to induce and probe the motion of molecules adsorbed on a metal surface. Through interaction of the molecule dipole with the electric field of the tip, rotation with 100% directionality is demonstrated. By mapping the rotational behaviour, it was possible to assign a specific pivot point, which is precisely defined by the atomic composition of the molecule and the surface structure, and to visualise the internal dipole of the molecule [1]. Translation of these molecules can also be induced, revealing details about the molecular dynamics by systematic change of the experimental parameters.
[1] G. J. Simpson et al., Nat. Commun. 10, 4631 (2019)