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Fractional Chern insulators in moiré flat bands with high Chern numbers

Chonghao Wang1,*, Xiaoyang Shen1,*, Ruiping Guo1,2,*, Wenhui Duan1,2,3, Chong Wang1,†, and Yong Xu1,3,‡

  • *These authors contributed equally to this work.
  • †Contact author: chongwang@mail.tsinghua.edu.cn
  • ‡Contact author: yongxu@mail.tsinghua.edu.cn

Phys. Rev. B 112, L201109 – Published 7 November, 2025

DOI: https://doi.org/10.1103/nkwx-twdl

Abstract

Recent discoveries of zero-field fractional Chern insulators in moiré materials have attracted intensive research interest. However, most current theoretical and experimental attempts focus on Chern bands with Chern number |C|=1, in analogy to the Landau levels. Here, we propose candidate material systems for realizing fractional Chern insulators with higher Chern numbers. The material setup involves Γ-valley twisted homobilayer transition metal dichalcogenides in proximity to a magnetic skyrmion lattice. The skyrmion exchange potential induces a flat band with a high Chern number C=−2. Using the momentum-space projected exact diagonalization method, we perform a comprehensive study at various filling factors, confirming the generalized Jain sequence. Our research provides theoretical guidance on realizing unconventional fractional Chern insulators beyond the Landau level picture.

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