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, Takashi Taniguchi, Jie Shan () and Kin Fai Mak ()
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Patrick Knüppel: Cornell University
Jiacheng Zhu: Cornell University
Yiyu Xia: Cornell University
Zhengchao Xia: Cornell University
Zhongdong Han: Cornell University
Yihang Zeng: Cornell University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Jie Shan: Cornell University
Kin Fai Mak: Cornell University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Twisted transition metal dichalcogenide (TMD) bilayers 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 of matter and the underlying band structure singularities has remained largely unexplored. Here, combining magnetic circular dichroism and exciton sensing measurements, we investigate the influence of a van Hove singularity (vHS) on the correlated phases in bilayer WSe2 with twist angle between 2 and 3 degrees. By tuning the vHS across the Fermi level using electric and magnetic fields, we observe Stoner ferromagnetism below moiré lattice filling one and Chern insulators at filling one. The experimental observations are supported by the continuum model band structure calculations. Our results highlight the prospect of engineering electronic phases of matter in moiré materials by tunable van Hove singularities.

Date: 2025
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DOI: 10.1038/s41467-025-57235-5

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