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説明:

This letter presents our findings on the recursive band gap engineering of chiral fermions in bilayer
graphene doubly aligned with hBN. By utilizing two interfering moiré potentials, we generate a supermoiré pattern which renormalizes the electronic bands of the pristine bilayer graphene, resulting in higher-order fractal gaps even at very low energies. These Bragg gaps can be mapped using a unique linear combination of periodic areas within the system. To validate our findings, we used electronic transport measurements to identify the position of these gaps as functions of the carrier density and establish their agreement with the predicted carrier densities and corresponding quantum numbers obtained using the continuum model. Our study provides conclusive evidence of quantization of the momentum-space area of quasi-Brillouin zones in a minimally incommensurate lattice. It fills essential gaps in understanding the band structure engineering of Dirac fermions by a doubly periodic superlattice spinor potential.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Band gap engineering, chiral fermions, supermoiré

刊行年月日: 2024-03-14

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 2335

研究助成金:

• United States Department of Defense | United States Army | U.S. Army Corps of Engineers FA5209 22P0166
• DST | Science and Engineering Research Board DST/SJF/PSA-01/2016-17

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-024-46672-3

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更新時刻: 2025-02-08 12:30:14 +0900

MDRでの公開時刻: 2025-02-08 12:30:15 +0900