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Decoupling and ordering of multilayer graphene on C-face 3C-SiC(111)

Bouhafs, C.; Stanishev, V.; Zakharov, A. A. LU ; Hofmann, T.; Kühne, P.; Iakimov, T.; Yakimova, R.; Schubert, M. and Darakchieva, V. (2016) In Applied Physics Letters 109(20).
Abstract

We show experimentally that few layer graphene (FLG) grown on the carbon terminated surface (C-face) of 3C-SiC(111) is composed of decoupled graphene sheets. Landau level spectroscopy on FLG graphene is performed using the infrared optical Hall effect. We find that Landau level transitions in the FLG exhibit polarization preserving selection rules and the transition energies obey a square-root dependence on the magnetic field strength. These results show that FLG on C-face 3C-SiC(111) behave effectively as a single layer graphene with linearly dispersing bands (Dirac cones) at the graphene K point. We estimate from the Landau level spectroscopy an upper limit of the Fermi energy of about 60 meV in the FLG, which corresponds to a carrier... (More)

We show experimentally that few layer graphene (FLG) grown on the carbon terminated surface (C-face) of 3C-SiC(111) is composed of decoupled graphene sheets. Landau level spectroscopy on FLG graphene is performed using the infrared optical Hall effect. We find that Landau level transitions in the FLG exhibit polarization preserving selection rules and the transition energies obey a square-root dependence on the magnetic field strength. These results show that FLG on C-face 3C-SiC(111) behave effectively as a single layer graphene with linearly dispersing bands (Dirac cones) at the graphene K point. We estimate from the Landau level spectroscopy an upper limit of the Fermi energy of about 60 meV in the FLG, which corresponds to a carrier density below 2.5 × 1011cm-2. Low-energy electron diffraction μ-LEED) reveals the presence of azimuthally rotated graphene domains with a typical size of ≤200 nm. μ-LEED mapping suggests that the azimuth rotation occurs between adjacent domains within the same sheet rather than vertically in the stack.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics Letters
volume
109
issue
20
publisher
American Institute of Physics
external identifiers
  • scopus:84995739786
  • wos:000388000000043
ISSN
0003-6951
DOI
10.1063/1.4967525
language
English
LU publication?
yes
id
270ed6f8-bb95-46fe-831c-e708b456a1bb
date added to LUP
2016-12-05 08:47:46
date last changed
2017-03-12 04:38:15
@article{270ed6f8-bb95-46fe-831c-e708b456a1bb,
  abstract     = {<p>We show experimentally that few layer graphene (FLG) grown on the carbon terminated surface (C-face) of 3C-SiC(111) is composed of decoupled graphene sheets. Landau level spectroscopy on FLG graphene is performed using the infrared optical Hall effect. We find that Landau level transitions in the FLG exhibit polarization preserving selection rules and the transition energies obey a square-root dependence on the magnetic field strength. These results show that FLG on C-face 3C-SiC(111) behave effectively as a single layer graphene with linearly dispersing bands (Dirac cones) at the graphene K point. We estimate from the Landau level spectroscopy an upper limit of the Fermi energy of about 60 meV in the FLG, which corresponds to a carrier density below 2.5 × 10<sup>11</sup>cm<sup>-2</sup>. Low-energy electron diffraction μ-LEED) reveals the presence of azimuthally rotated graphene domains with a typical size of ≤200 nm. μ-LEED mapping suggests that the azimuth rotation occurs between adjacent domains within the same sheet rather than vertically in the stack.</p>},
  articleno    = {203102},
  author       = {Bouhafs, C. and Stanishev, V. and Zakharov, A. A. and Hofmann, T. and Kühne, P. and Iakimov, T. and Yakimova, R. and Schubert, M. and Darakchieva, V.},
  issn         = {0003-6951},
  language     = {eng},
  month        = {11},
  number       = {20},
  publisher    = {American Institute of Physics},
  series       = {Applied Physics Letters},
  title        = {Decoupling and ordering of multilayer graphene on C-face 3C-SiC(111)},
  url          = {http://dx.doi.org/10.1063/1.4967525},
  volume       = {109},
  year         = {2016},
}