Dirac electrons in a dodecagonal graphene quasicrystal
- Authors
- Ahn, Sung Joon; Moon, Pilkyung; Kim, Tae-Hoon; Kim, Hyun-Woo; Shin, Ha-Chul; Kim, Eun Hye; Cha, Hyun Woo; Kahng, Se-Jong; Kim, Philip; Koshino, Mikito; Son, Young-Woo; Yang, Cheol-Woong; Ahn, Joung Real
- Issue Date
- 24-8월-2018
- Publisher
- AMER ASSOC ADVANCEMENT SCIENCE
- Citation
- SCIENCE, v.361, no.6404, pp.782 - +
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENCE
- Volume
- 361
- Number
- 6404
- Start Page
- 782
- End Page
- +
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/73728
- DOI
- 10.1126/science.aar8412
- ISSN
- 0036-8075
- Abstract
- Quantum states of quasiparticles in solids are dictated by symmetry. We have experimentally demonstrated quantum states of Dirac electrons in a two-dimensional quasicrystal without translational symmetry. A dodecagonal quasicrystalline order was realized by epitaxial growth of twisted bilayer graphene rotated exactly 30 degrees. We grew the graphene quasicrystal up to a millimeter scale on a silicon carbide surface while maintaining the single rotation angle over an entire sample and successfully isolated the quasicrystal from a substrate, demonstrating its structural and chemical stability under ambient conditions. Multiple Dirac cones replicated with the 12-fold rotational symmetry were observed in angle-resolved photoemission spectra, which revealed anomalous strong interlayer coupling with quasi-periodicity. Our study provides a way to explore physical properties of relativistic fermions with controllable quasicrystalline orders.
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- Appears in
Collections - College of Science > Department of Physics > 1. Journal Articles
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