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O: Fachverband Oberflächenphysik

O 74: Nanostructured Surfaces and Thin Films I: Synthesis and Properties (joint session O/CPP)

O 74.5: Vortrag

Mittwoch, 18. März 2020, 16:00–16:15, WIL B321

The electronic structure of atomically-precise graphene nano-ribbons investigated by photoemission tomography — Lukas Reicht¹, Xiaosheng Yang^{2, 3}, Larissa Egger¹, Philipp Hurdax¹, Francois C. Bocquet^{2, 3}, Georg Koller¹, Petra Tegeder⁴, Alexander Gottwald⁵, Mathias Richter⁵, Michael G. Ramsey¹, F. Stefan Tautz^{2, 3}, Serguei Soubatch^{2, 3}, and •Peter Puschnig¹ — ¹Institute 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.