Ambipolar charge transport in quasi-free-standing monolayer graphene on SiC obtained by gold intercalation
Journal article, 2020
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 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.
Author
Kyung Ho Kim
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Hans He
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Claudia Struzzi
MAX IV Laboratory
Alexei Zakharov
MAX IV Laboratory
Cristina E. Giusca
National Physical Laboratory (NPL)
Alexander Tzalenchuk
National Physical Laboratory (NPL)
Royal Holloway University of London
Yung Woo Park
Seoul National University
University of Pennsylvania
Rositsa Yakimova
Linköping University
Sergey Kubatkin
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Samuel Lara Avila
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Physical Review B
24699950 (ISSN) 24699969 (eISSN)
Vol. 102 165403Epitaxiell grafen för metrologi, sensorer och elektronik
Swedish Foundation for Strategic Research (SSF) (GMT14-0077), 2016-01-01 -- 2020-12-31.
Novel two-dimensional systems: from growth to applications
Swedish Foundation for Strategic Research (SSF) (RMA15-0024), 2016-05-01 -- 2021-06-30.
Graphene nanoribbons and organic nanofibers electronics
Swedish Foundation for Strategic Research (SSF) (IS14-0053), 2018-01-01 -- 2020-12-31.
Swedish Foundation for Strategic Research (SSF) (IS14-0053), 2015-01-01 -- 2017-12-31.
Areas of Advance
Nanoscience and Nanotechnology
Infrastructure
Nanofabrication Laboratory
Subject Categories
Condensed Matter Physics
DOI
10.1103/PhysRevB.102.165403