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O: Fachverband Oberflächenphysik
O 33: Poster Graphene: Electronic Structure and Excitations
O 33.2: Poster
Dienstag, 18. März 2025, 13:30–15:30, P3
Confinement-mediated intercalation of metals in epitaxial graphene: Unlocking room temperature intercalation — •Kathrin Küster1, Stefan Wundrack2,3, Markus Gruschwitz4, Sawani Datta1, Bharti Matta1, Teresa Tschirner2, Marius Eckert2,3, Rainer Stosch2, Christoph Tegenkamp4, Ulrich Starke1, Klaus Pierz2, and Andrey Bakin2 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart — 2Physikalisch-Technische Bundesanstalt, Braunschweig — 3Institut für Halbleitertechnik - TU-Braunschweig — 4Institut für Physik, TU Chemnitz
Intercalation of materials underneath epitaxial graphene is an effective way to tune graphene’s properties but also to stabilize otherwise unstable 2D materials. Usually, this procedure requires extreme conditions like ultra-high vacuum and elevated temperatures often above 400 ∘C. Within the DFG research unit FOR 5242 we also investigate alternative routes of intercalation under more accessible conditions. Here, we report on the intercalation of Ga and In under monolayer graphene at ambient conditions. A multi-technique approach combining spectro-microscopy techniques with density functional theory calculations gives detailed insights into the intercalation pathways and the diffusion of the intercalants at the interface between graphene and the SiC substrate. It is evident that the intercalated atoms are strongly bound to the topography of the SiC terraces during their diffusion and exhibit anomalies in their diffusion behavior. The monolayer graphene is transformed into a decoupled bilayer upon intercalation and the intercalated materials develop their own metallic 2D electronic structure.
Keywords: epitaxial graphene; intercalation; gallium; indium