Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 28: Graphene: Electronic Structure and Excitations (joint session O/HL)
O 28.3: Talk
Tuesday, March 18, 2025, 11:00–11:15, H6
Electronic structure of intercalated epitaxial graphene: A first principles study — •Andres Unigarro1, Florian Günther2, Philip Schädlich1, Bharti Matta3, Philipp Rosenzweig3, Kathrin Küster3, Ulrich Starke3, Thomas Seyller1, and Sibylle Gemming1 — 1Institute of physics, TU Chemnitz, Chemnitz, Germany — 2UNESP, Rio Claro, Brazil — 3Max-Planck-Institut für Festkörperforschung, Stuttgart
Two-dimensional materials such as graphene are fascinating because they combine unique mechanical and electronic properties. The next level of complexity, however, comprises the assembly of various stacked 2D materials to generate structures with desired properties. Intercalation of epitaxial graphene systems is an effective method to tailor the electronic, optical, and transport properties of graphene while keeping its honeycomb lattice on SiC. Furthermore, intercalation facilitates the synthesis of otherwise unstable 2D layers. A wide range of elements have been used as intercalants below a graphene sheet, forming often well-defined heterobilayers with different functionalities. In particular, intercalation of heavy elements such as Pb and Bi are specially promising since they can introduce additional effects such as spin-orbit coupling to the electron gas of graphene and Rashba spin polarization. Using first-principles methods, we investigate the modifications in the electronic structure of epitaxial graphene due to proximity effects induced by intercalation.
Keywords: First-principles methods; Graphene; Intercalation; Electronic structure