Atomic arrangements of quasicrystal bilayer graphene: Interlayer distance expansion

Yuki Fukaya, Yuhao Zhao, Hyun Woo Kim, Joung Real Ahn, Hirokazu Fukidome, Iwao Matsuda

Research output: Contribution to journalArticlepeer-review

Abstract

Bilayer graphene exhibits outstanding characteristics that can be modified by adjusting the twist angle between two layers. An exact 30°-twisted bilayer graphene forms a material comprising two-dimensional quasicrystals accompanied by a relativistic Dirac fermion. In this study, the atomic arrangements of quasicrystal bilayer graphene on a SiC(0001) substrate are identified using positron diffraction. The interlayer distance in quasicrystal bilayer graphene is determined to be 3.46 Å, revealing an expansion of 0.17 Å as compared with that of Bernal-stacked bilayer graphene. This result provides important insights for elucidating the origin of the magnitude of coupling between graphene layers.

Original languageEnglish
Article numberL180202
JournalPhysical Review B
Volume104
Issue number18
DOIs
Publication statusPublished - 2021 Nov 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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