Regensburg 2025 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 4: 2D Materials and their Heterostructures II (joint session DS/HL)

DS 4.1: Hauptvortrag

Dienstag, 18. März 2025, 09:30–10:00, H3

Graphene-based epitaxial 2D heterosystems: making graphene great again — •Christoph Tegenkamp — Institut für Physik, TU Chemnitz

2D materials and their heterostructures are at the forefront of research, anticipated to serve as fundamental building blocks for new quantum materials. Proximity coupling is a key concept in this domain, enabling diverse and novel functionalities. Epitaxial graphene (EG) grown on SiC(0001) resembles a truly 2D electron gas system, celebrated for its manifold and flexible functionalization schemes at both its vacuum and interface sites. These functionalization strategies enable extreme doping scenarios in graphene, tuning spin-orbit coupling, realizing interface states, or introducing mini-bands through zone folding. The controlled transition from linear to flat bands in EG, along with the coupling of functionalized epitaxial graphene to 2D electron gases (2DEGs), opens avenues for exploring electronic correlation effects and mesoscopic phenomena in epitaxial 2D heterostructures. In this presentation, I will showcase some recent findings achieved through the adsorption and intercalation of elements such as Pb and Sn, demonstrating their potential to further tune the properties of graphene.

Keywords: graphene; proximity coupling; spin orbit coupling; Mott states; intercalation