Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 94: Focus Session: Proximity Effects in Epitaxial Graphene I

O 94.1: Topical Talk

Donnerstag, 21. März 2024, 15:00–15:30, MA 141

Tailoring the electronic structure of epitaxial graphene on SiC — •Kathrin Küster — Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany

Inducing correlation effects in low dimensional electron gases by proximity coupling is a powerful concept for the design of new quantum materials with tailored electronic, magnetic and optical properties. The DFG research unit FOR5242 investigates spin-orbit interaction and electronic correlations of 2D electron gas systems using epitaxial graphene grown on SiC substrates. After a brief introduction to the objectives of the research unit, I will present two different projects of our group. (i) By intercalation with lanthanides like Gd [1] and Yb [2,3], graphene can be driven to extreme doping levels where the system deviates from the low-energy limit of massless Dirac fermions. (ii) In contrast, intercalation of graphene with Pb leads to the formation of almost charge neutral graphene. In general intercalation with heavy elements is an interesting research area since those might induce spin-orbit coupling effects and exotic collective phenomena. Besides the influence of the intercalants on the electronic properties of the graphene, also the investigation of the electronic and structural properties of the intercalants is an exciting topic on its own since they often strongly deviate from their 3D counterparts.

[1] S. Link et al. PRB 100, 121407(R) (2019); [2] P. Rosenzweig et al. PRB 100, 035445 (2019), [3] P. Rosenzweig et al. PRL 125, 176403 (2020); [4] B. Matta et al. Phys. Rev. Research 4, 023250 (2022); [5] P. Schädlich et al. Adv. Mater. Interfaces 2300471 (2023).

Keywords: graphene; SiC; electronic structure; correlation effects; proximity coupling