SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Poster: Graphene
O 64.9: Poster
Mittwoch, 29. März 2023, 18:00–20:00, P2/EG
Band structure and charge carrier dynamics of a Pb-intercalated graphene sheet on Ni(111) — •Eva Sophia Walther1, Katharina Hilgert1, Christina Schott1, Sebastian Hedwig1, Ka Man Yu1, Martin Aeschlimann1, and Benjamin Stadtmüller1,2 — 1Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern, Germany — 2Institute of Physics, Material Science in Mainz, JGU Mainz, Germany
The discovery of graphene acted as a starting point for the vast research field of 2D materials. However, on metal surfaces, most of the enthusiasm for exploring graphene's unique properties has been tempered by the strong interaction with its substrate, which results in severe changes in its electronic properties. One way to reduce the graphene-surface interactions is the intercalation of heavy metal atoms between the graphene and the underlying substrate. In our work, we use the highly reactive Ni(111) surface as a graphene substrate. On this surface, the linear dispersion of the Dirac cone is severely distorted and the K-point is located far below the Fermi energy. Here, we will show that Pb intercalation recovers the linear dispersion of the free-standing graphene. Using time- and momentum-resolved photoemission, we will further determine the influence of the Pb intercalation for the ultrafast charge carriers dynamics at the K-point of the Gr/Ni(111) interface.