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Moiré superlattices (MSLs) are an emerging class of two-dimensional functional materials whose electronic states can be tuned by the twist angle between two van der Waals layers and/or the relative placement of the layers. The intriguing properties of MSLs are closely correlated to the moiré potential, which is the electrostatic potential induced by interlayer coupling. Intensive efforts have been made to understand the nature and distribution of the moiré potential by using various experimental and theoretical techniques. However, the experimental observation of the moiré potential is still challenging because of the possible presence of the surface and/or interlayer contaminants. In this work, we develop a method to obtain hexagonal boron nitride (hBN) nanolayers (with or without twist) using a specially designed chemical exfoliation technique. The resulting hBN nanolayers are atomically clean and strain free, hence providing ideal MSLs for the investigation of their moiré potential. Aberration-corrected high resolution transmission electron microscopy measurements on the twisted hBN nanolayers allow us to observe moiré diffraction spots in Fourier space. Then, the moiré potential is reconstructed by the inverse fast Fourier transform of the moiré diffraction spots. It has been revealed that the local interlayer atomic overlap plays a decisive role in determining the periodicity and distribution of the moiré potential, as supported by density functional theory calculations. This work not only provides a general strategy to observe the moiré potential in MSLs, but it also expands the application of electron microscopy to the further study of MSLs with atomic resolution.

権利情報:

• In Copyright
  

  This document is the Accepted Manuscript version of a Published Work that appeared in final form in JOURNAL OF PHYSICAL CHEMISTRY C, copyright © 2025 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.5c00804.

キーワード: hexagonal boron nitride (hBN), Moiré superlattices, Moiré potential, two-dimensional functional material, aberration-corrected TEM, density functional theory calculation

刊行年月日: 2025-04-24

出版者: American Chemical Society

掲載誌:

• JOURNAL OF PHYSICAL CHEMISTRY C (ISSN: 19327447)

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5432

公開URL: https://doi.org/10.1021/acs.jpcc.5c00804

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更新時刻: 2025-04-17 16:15:36 +0900

MDRでの公開時刻: 2026-04-15 08:25:05 +0900