1. Ambipolar charge transport in quasi-free-standing monolayer graphene on SiC obtained by gold intercalation
- Author
-
Kim, Kyung Ho, He, Hans, Struzzi, Claudia, Zakharov, Alexei, Giusca, Cristina, Tzalenchuk, Alexander, Yakimova, Rositsa, Kubatkin, Sergey, and Lara-Avila, Samuel
- Subjects
Condensed Matter - Materials Science ,Condensed Matter - Mesoscale and Nanoscale Physics - Abstract
We present a study of quasi-free-standing monolayer graphene obtained by intercalation of Au atoms at the interface between the carbon buffer layer (Bu-L) and the silicon-terminated face (0001) of 4H-silicon carbide. Au intercalation is achieved by deposition of atomically thin Au on the Bu-L followed by annealing at 850 {\deg}C in an Argon atmosphere. We explore the intercalation of Au and decoupling of the Bu-L into quasi-free-standing monolayer graphene by surface science characterizations and electron transport in top-gated electronic devices. By gate-dependent magnetotransport we find that the Au-intercalated buffer layer displays all properties of monolayer graphene, namely gate tunable ambipolar transport across the Dirac point, and n- or p-type doping depending on the Au content.
- Published
- 2020
- Full Text
- View/download PDF