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Description:

To realize the applicative potential of 2D materials twistronics, scalable synthesis and assembly techniques need to meet stringent requirements in terms of interface cleanness and twist-angle homogeneity. Here, we show that small-angle twisted bilayer graphene can be assembled from separated graphene single-crystals grown by chemical vapour deposition, ensuring electronic properties dominated by a device-scale-uniform moiré potential. Via low-temperature dual-gated magnetotransport we demonstrate the hallmarks of a 2.4°-twisted superlattice, including tunable regimes of interlayer coupling, reduced Fermi velocity, large interlayer capacitance, and density-independent Brown-Zak oscillations. The observation of these features in the electrical transport characteristics establishes CVD-based twisted bilayer graphene as an alternative to `tear-and-stack’ exfoliated flakes for fundamental studies, while serving as a proof-of-concept for future large-scale assembly.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Twisted bilayer graphene, moiré potential, transport properties

Date published: 2022-07-13

Publisher: American Chemical Society (ACS)

Journal:

• Nano Letters (ISSN: 15306984) vol. 22 issue. 13 p. 5252-5259

Funding:

• Ministry of Education, Culture, Sports, Science and Technology JPMXP0112101001
• Core Research for Evolutional Science and Technology JPMJCR15F3
• H2020 Future and Emerging Technologies 785219
• H2020 Future and Emerging Technologies 881603
• Japan Society for the Promotion of Science JP20H00354

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.nanolett.2c01114

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Updated at: 2025-03-03 16:30:31 +0900

Published on MDR: 2025-03-03 16:30:31 +0900