Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: Poster: Graphene - Electronic Properties, Structure, Adsorption, Intercalation and Doping (joint session O/TT)

O 47.7: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

Landau quantization in a graphene monolayer on WSe₂ and NbSe₂ — •Felix Förschner¹, Lena Stoppel¹, Fabian Paschke¹, Julia Tesch¹, Yuriy Dedkov^2,1, and Mikhail Fonin¹ — ¹Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Deutschland — ²Department of Physics, Shanghai University, 200444 Shanghai, China

By depositing graphene on transition metal dichalcogenides (TMDs), it is possible to alter the electronic properties of graphene [1]. Here we focus on the fabrication of graphene on WSe₂ and NbSe₂, which was successfully performed by an adapted wet chemical transfer process. By means of low-temperature scanning tunneling microscopy we investigate the atomic structure of graphene and observe different Moiré structures indicating a successful transfer of graphene onto the TMD. In an external magnetic field, Landau level sequences are observed giving access to the electronic properties of graphene, i.e. doping level, Fermi velocity etc. Detailed analysis of the obtained tunneling spectra shows that each Landau level is split into subpeaks, where the pronounced splitting strength grows with increasing magnetic field. The magnitude of the observed splitting indicates an enhanced spin-orbit interaction strength in graphene due to the presence of the TMD substrate.

[1] Z. Wang et al., Nature Comm. 6, 8339 (2015).