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 165403

Epitaxiell grafen för metrologi, sensorer och elektronik

Swedish Foundation for Strategic Research (SSF), 2016-01-01 -- 2020-12-31.

Novel two-dimensional systems: from growth to applications

Swedish Foundation for Strategic Research (SSF), 2016-05-01 -- 2021-06-30.

Graphene nanoribbons and organic nanofibers electronics

Swedish Foundation for Strategic Research (SSF), 2018-01-01 -- 2020-12-31.

Swedish Foundation for Strategic Research (SSF), 2015-01-01 -- 2017-12-31.

Areas of Advance

Nanoscience and Nanotechnology (SO 2010-2017, EI 2018-)

Infrastructure

Nanofabrication Laboratory

Subject Categories

Condensed Matter Physics

DOI

10.1103/PhysRevB.102.165403

More information

Latest update

12/15/2020