Article 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

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(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.

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Keyword: van Hove singularity (vHS)
, moiré WSe2
, correlated states


Date published: 2025-02-25

Publisher: Springer Science and Business Media LLC

Journal:

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

Funding:

  • 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

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

MDR DOI:

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

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Updated at: 2026-02-17 08:30:04 +0900

Published on MDR: 2026-02-16 18:00:49 +0900

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