SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster: 2D Materials II

O 36.7: Poster

Dienstag, 28. März 2023, 18:00–20:00, P2/EG

Pb-induced proximity effects in epitaxial graphene — Andres David Pena Unigarro, Chitran Ghosal, •Christoph Tegenkamp, and Sibylle Gemming — Institut für Physik, TU Chemnitz, Reichenhainer Str. 70, 09126 Chemnitz

A current topic in material science deals with the controlled assembly of various 2D materials to generate structures with new quantum characteristics. Such modifications can be achieved by proximity effects, e.g., by intercalation and adsorption. One promising route is to use epitaxial buffer layer structures on SiC(0001) surfaces, which transforms into a quasi free monolayer graphene with new 2D interface structures upon intercalation. As suggested by density functional theory (DFT) studies, elements of the IV group such as Pb can be used for this purpose. In this case, intercalation of heavy atoms like Pb are expected to introduce additional effects such as spin-orbit coupling to the electron gas of graphene. In this contribution, we investigated the intercalation of Pb on buffer layers on SiC(0001). Suspended and charge neutral graphene emerged, and the intercalated Pb formed plumbene honeycomb lattices, which are rotated by 7.5° with respect to graphene. Along with this twist, a proximity-induced modulation of the hopping parameter in graphene opens a band gap of around 30 meV at the Fermi energy, giving rise to a metal-insulator transition. We present first results obtained with DFT focusing on the modifications of graphene's electronic structure in the presence of twisted Pb layers.