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O: Fachverband Oberflächenphysik

O 61: Graphene II: Adsorption, Intercalation and Doping

O 61.10: Vortrag

Mittwoch, 9. März 2016, 17:15–17:30, S053

Intercalation of Gadolinium underneath graphene on SiC(0001) — •Stefan Link, Stiven Forti, Alexander Stöhr, and Ulrich Starke — Max-Planck-Institut für Festkörperforschung Stuttgart

Tuning the electronic properties of graphene for potential applications has raised intensive research. Besides spatial confinement for the introduction of a band gap or covalent functionalization, the intercalation of foreign atom species is a promising approach. A highly interesting state of graphene lies in the extreme doping regime, where a van-Hove singularity is reached at the Fermi level. Although this is a rather difficult task, it might pave the way to introduce interesting effects like superconductivity. Gating is illusional for this purpose due to the lack of appropriate dielectrica. Notably, the introduction of dopant adatoms like alkali and/or earth alkali metals onto both sides of the graphene leads to success but on the cost of strongly reduced stability. Here we show in a different approach that such a system can be produced with strong thermal and chemical stability. The system develops by intercalating Gadolinium atoms beneath the so called zerolayer graphene on SiC(0001). We make use of the advanced fabrication of epitaxial graphene on SiC(0001) in our group to achieve homogeneous results on a large scale. This gives the opportunity for exploring graphene's properties in this exotic regime. We show that reaching this regime is accompanied by strong renormalization effects in the electronic band structure, which are partially driven by strong electron-phonon coupling.