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

Research output: Contribution to journalArticle

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 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.

Details

Authors
  • C. Bouhafs
  • V. Stanishev
  • A. A. Zakharov
  • T. Hofmann
  • P. Kühne
  • T. Iakimov
  • R. Yakimova
  • M. Schubert
  • V. Darakchieva
Organisations
External organisations
  • Linköping University
  • University of Nebraska
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Materials Engineering
Original languageEnglish
Article number203102
JournalApplied Physics Letters
Volume109
Issue number20
Publication statusPublished - 2016 Nov 14
Publication categoryResearch
Peer-reviewedYes