Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Focus Session: Functional Molecules at Surfaces II

O 41.4: Vortrag

Dienstag, 17. März 2020, 11:30–11:45, TRE Ma

STM-induced tautomerization of phthalocyanines on BiAg2/Ag(111) — •Markus Böhme1, Markus Leisegang1, David Maiberger1, and Matthias Bode1,21Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Wilhelm Conrad Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

Organic molecules such as deprotonated phthalocyanines can show a tautomerization process in which the inner hydrogen atom changes its position. This electron-induced process cannot only be be triggered when the STM tip is positioned directly above the molecule, but also by injecting charge carriers into the substrate a few nm away from the molecules [1,2]. Whereas experiments have mostly been performed on noble metals with a relatively simple electronic structure, such as Ag(111) with its electron-like quasi-free surface state, we will focus in this talk on a surface with a more complex band structure, i.e., the BiAg2 surface alloy on Ag(111) which exhibits a giant Rashba effect [3]. We will present voltage- and current-dependent data of the tautomerization rate of HPc on BiAg2 /Ag(111) and discuss the angular dependency of the switching rate of the molecule.
[1] P. Liljeroth et. al., Science 317, 1203-1206 (2007).
[2] M. Leisegang et. al., Nano. Lett. 18, 2165 (2018).
[3] C. Ast et. al., Phys. Rev. Lett. 98, 186807 (2007).

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