論文 Correlated states controlled by a tunable van Hove singularity in moiré WSe2 bilayers

Patrick Knüppel ; Jiacheng Zhu ; Yiyu Xia ; Zhengchao Xia ; Zhongdong Han ; Yihang Zeng ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Jie Shan ; Kin Fai Mak

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Patrick Knüppel, Jiacheng Zhu, Yiyu Xia, Zhengchao Xia, Zhongdong Han, Yihang Zeng, Kenji Watanabe, Takashi Taniguchi, Jie Shan, Kin Fai Mak. Correlated states controlled by a tunable van Hove singularity in moiré WSe2 bilayers. Nature Communications. 2025, 16 (), 1959. https://doi.org/10.1038/s41467-025-57235-5

説明:

(abstract)

Twisted bilayers of transition metal dichalcogenide semiconductors have enabled the discovery of superconductivity, ferromagnetism, correlated insulators and a series of new topological phases of matter. However, the connection between these electronic phases and the underlying band structure singularities in these materials has remained largely unexplored. Here, combining the magnetic circular dichroism and electronic compressibility measurements, we investigate the influence of a van Hove singularity on the correlated phases in bilayer WSe2 with twist angle between 2-3 degrees. We demonstrate stabilizing the Stoner ferromagnetism below moiré lattice filling one and Chern insulators at filling one by tuning the van Hove singularity cross the Fermi level using the electric and magnetic fields. The experimental observations are supported by the continuum model band structure calculations. Our results highlight the prospect of engineering the electronic phases by tunable van Hove singularities.

権利情報:

キーワード: van Hove singularity (vHS)
, moiré WSe2
, correlated states


刊行年月日: 2025-02-25

出版者: Springer Science and Business Media LLC

掲載誌:

  • Nature Communications (ISSN: 20411723) vol. 16 1959

研究助成金:

  • National Science Foundation DMR-1807810
  • National Science Foundation DMR-2114535
  • National Science Foundation DMR-1807810
  • United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research FA9550-19-1-0390
  • United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research FA9550-20-1-0219
  • United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research FA9550-19-1-0390
  • United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research FA9550-20-1-0219
  • David and Lucile Packard Foundation
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
  • MEXT | JST | Core Research for Evolutional Science and Technology JPMJCR15F3
  • MEXT | JST | Core Research for Evolutional Science and Technology JPMJCR15F3

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-025-57235-5

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更新時刻: 2026-02-17 08:30:04 +0900

MDRでの公開時刻: 2026-02-16 18:00:49 +0900

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