Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 109: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VII
O 109.3: Vortrag
Freitag, 16. März 2018, 11:00–11:15, MA 004
Oxygen-triggered electronic and structural decoupling at the PTCDA/Cu(100) interface — •Xiaosheng Yang1,2, Simon Weiß1,2, Ina Krieger3, Timo Heepenstrick3, Michael Hollerer4, Philipp Hurdax4, Daniel Lüftner4, Peter Puschnig4, Georg Koller4, Michael Ramsey4, Moritz Sokolowski3, Frank Stefan Tautz1,2, and Serguei Soubatch1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany — 2Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, Germany — 3Institut für Physikalische und Theoretische Chemie, Universität Bonn, Germany — 4Institut für Physik, Universität Graz, NAWI Graz, Austria
The electronic states and geometric vertical structures of perylene-tetracarboxylic dianhydride (PTCDA) molecule upon an oxygen-reconstructed (√2 × 2 √2)R45∘ Cu(100) surface are investigated using ARPES and the NIXSW technique, respectively. The orbital tomography measurement found that, in contrast to PTCDA on intrinsic Cu(100) where strong molecule-substrate interactions are present [1], the oxygen adsorbed on Cu(100) prevents change transfer from metal substrate into the PTCDA molecule. Further, the geometry of the PTCDA layer on the oxygen-recontructed surface is determined to be flat with a high adsorption height. The results corroborate that the oxygen simultaneously induces electronic and structural decoupling at the molecule-metal interface.
[1] D. Lüftner et al., Physical Review B 96, 125402 (2017)