Ambipolar charge transport in quasi-free-standing monolayer graphene on SiC obtained by gold intercalation

Kyung Ho Kim, Hans He, Claudia Struzzi, Alexei Zakharov, Cristina E. Giusca, Alexander Tzalenchuk, Yung Woo Park, Rositsa Yakimova, Sergey Kubatkin, Samuel Lara-Avila
2020 Physical review B  
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 an atomically thin Au layer on the Bu-L followed by annealing at 850°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 characterization
more » ... 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, but we find no observable enhancement of spin-orbit effects in the graphene layer, despite its proximity to the intercalated Au layer.
doi:10.1103/physrevb.102.165403 fatcat:fgeec7ncxzbtflbgswo47wuvfq