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

Kim, Kyung Ho ; He, Hans ; Struzzi, Claudia LU orcid ; Zakharov, Alexei LU ; Giusca, Cristina E. ; Tzalenchuk, Alexander ; Park, Yung Woo ; Yakimova, Rositsa ; Kubatkin, Sergey and Lara-Avila, Samuel (2020) In Physical Review B 102(16).
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 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... (More)

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.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
102
issue
16
article number
165403
publisher
American Physical Society
external identifiers
  • scopus:85094890297
ISSN
2469-9950
DOI
10.1103/PhysRevB.102.165403
language
English
LU publication?
yes
id
95d1bbef-31bd-4836-97eb-2f5d3b157abc
date added to LUP
2021-01-07 15:03:12
date last changed
2025-10-14 10:43:02
@article{95d1bbef-31bd-4836-97eb-2f5d3b157abc,
  abstract     = {{<p>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. </p>}},
  author       = {{Kim, Kyung Ho and He, Hans and Struzzi, Claudia and Zakharov, Alexei and Giusca, Cristina E. and Tzalenchuk, Alexander and Park, Yung Woo and Yakimova, Rositsa and Kubatkin, Sergey and Lara-Avila, Samuel}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{16}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Ambipolar charge transport in quasi-free-standing monolayer graphene on SiC obtained by gold intercalation}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.102.165403}},
  doi          = {{10.1103/PhysRevB.102.165403}},
  volume       = {{102}},
  year         = {{2020}},
}