Journal
PHYSICAL REVIEW B
Volume 104, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L180202
Keywords
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Funding
- JSPS KAKENHI [JP18H03874, JP19H04398, JP19H02590, JP16H06361, JP18H01877, JP19K22134]
- Murata Science Foundation
- Toray Science Foundation
- National Research Foundation (NRF) of Korea [2021M2E8A1048961]
- Photon Factory Program Advisory Committee of the Institute of Materials Structure Science [2017G639]
- National Research Foundation of Korea [2021M2E8A1048961] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The study reveals that a precisely 30-degree twisted bilayer graphene forms a quasicrystal structure on a SiC(0001) substrate, with an interlayer distance of 3.46 angstrom that is 0.17 angstrom larger than that of Bernal-stacked bilayer graphene. This finding provides important insights into the magnitude of coupling between graphene layers.
Bilayer graphene exhibits outstanding characteristics that can be modified by adjusting the twist angle between two layers. An exact 30 degrees-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 angstrom, revealing an expansion of 0.17 angstrom as compared with that of Bernalstacked bilayer graphene. This result provides important insights for elucidating the origin of the magnitude of coupling between graphene layers.
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