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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 79: Nanostructured Surfaces and Thin Films I: 1D and 2D Networks (joint session O/CPP)

CPP 79.5: Talk

Wednesday, March 18, 2020, 16:00–16:15, WIL B321

The electronic structure of atomically-precise graphene nano-ribbons investigated by photoemission tomographyLukas Reicht1, Xiaosheng Yang2, 3, Larissa Egger1, Philipp Hurdax1, Francois C. Bocquet2, 3, Georg Koller1, Petra Tegeder4, Alexander Gottwald5, Mathias Richter5, Michael G. Ramsey1, F. Stefan Tautz2, 3, Serguei Soubatch2, 3, and •Peter Puschnig11Institute of Physics, University of Graz, Austria — 2Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany. — 3Jülich Aachen Research Alliance (JARA), Germany — 4Physikalisch-Chemisches Institut, Universität Heidelberg, Germany. — 5Physikalisch-Technische Bundesanstalt (PTB), Germany.

In this contribution we investigate the electronic structure of armchair graphene nanoribbons (AGNRs) by means of angle-resolved photoemission spectroscopy and density functional calculations. Specifically, using an orientated AGNRs with a width of 7 carbon atoms adsorbed on a stepped Au surface, we demonstrate how photoemission tomography can be used to shed light on the electronic structure of its frontier valence bands. We present a series of constant binding energy momentum maps which allow us to identify all relevant valence (sub)-bands of this graphene nanoribbon. By comparing theoretical results for free-standing and adsorbed ribbons, we investigate the degree of molecule-substrate hybridization and inter-ribbon interactions thereby demonstrating that photoemission tomography proves to be a powerful technique to study the electronic structure of such quantum confined 1D systems.

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