Article Realizing one-dimensional moiré chains with strong electron localization in two-dimensional twisted bilayer WSe 2

Ya-Ning Ren ; Hui-Ying Ren ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Lin He

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Ya-Ning Ren, Hui-Ying Ren, Kenji Watanabe, Takashi Taniguchi, Lin He. Realizing one-dimensional moiré chains with strong electron localization in two-dimensional twisted bilayer WSe 2. Proceedings of the National Academy of Sciences. 2024, 121 (45), e2405582121. https://doi.org/10.1073/pnas.2405582121

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(abstract)

Two-dimensional (2D) moiré systems based on twisted bilayer graphene and transition metal dichalcogenides provide a promising platform to investigate emergent phenomena driven by strong electron-electron interactions in partially-filled flat bands1-11. A natural question arises: is it possible to expand the 2D correlated moiré physics to one-dimensional (1D)? This requires selectively doping of 1D moiré chain embedded in the 2D moiré systems, which is an outstanding challenge in experiment and seems to be not within the grasp of today’s technology. Therefore, an experimental demonstration of the 1D moiré chain with partially-filled flat bands remains absent. Here we show that we can introduce 1D boundaries, separating two regions with different twist angles, in twisted bilayer WSe2 (tWSe2) by using scanning tunneling microscopy (STM), and demonstrate that the flat bands of moiré sites along the 1D boundaries can be selectively filled. The charge and discharge states of correlated moiré electrons in the 1D moiré chain can be directly imaged and manipulated by combining a back-gate voltage with the STM bias. Our results open the door for realizing new correlated electronic states of the 1D moiré chain in 2D systems.

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Keyword: 1D moiré chains, twisted bilayer WSe2, correlated electronic states

Date published: 2024-11-05

Publisher: Proceedings of the National Academy of Sciences

Journal:

  • Proceedings of the National Academy of Sciences (ISSN: 10916490) vol. 121 issue. 45 e2405582121

Funding:

  • National Natural Science Foundation of China 12141401
  • MOST | National Key Research and Development Program of China 2021YFA1401900

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

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First published URL: https://doi.org/10.1073/pnas.2405582121

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Updated at: 2025-03-03 16:30:20 +0900

Published on MDR: 2025-03-03 16:30:20 +0900

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