Observation of a Reconstructed Chern Insulator in Twisted Bilayer MoTe2
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911522282799104 |
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| author | Wu, Min Li, Lingxiao Ouyang, Yunze Jiang, Yifan Qiu, Wenxuan Zhang, Zaizhe Huo, Zihao Yang, Qiu Tian, Ming Wan, Neng Watanabe, Kenji Taniguchi, Takashi Lei, Shiming Wu, Fengcheng Lu, Xiaobo |
| author_facet | Wu, Min Li, Lingxiao Ouyang, Yunze Jiang, Yifan Qiu, Wenxuan Zhang, Zaizhe Huo, Zihao Yang, Qiu Tian, Ming Wan, Neng Watanabe, Kenji Taniguchi, Takashi Lei, Shiming Wu, Fengcheng Lu, Xiaobo |
| contents | Twisted bilayer MoTe2 is a prototypical moire material in which long-wavelength superlattices amplify electron correlations, enabling a wealth of emergent quantum phases. To date, experimental efforts have focused primarily on small twist angles (typically smaller than 4deg ), whereas the larger-angle regime-where moire bands become more dispersive and correlations are reduced-has remained largely unexplored. Here we chart the topological phase space of tMoTe2 at a relatively large twist angle of approximately 4.54deg, accessing a moderately correlated regime with enhanced bandwidth. In contrast to small-angle devices that predominantly host fractional quantum anomalous Hall or spin Hall responses, we uncover multiple Chern-insulating states with C = 1 at moire fillings v = -1, -0.53 and -1/2. Strikingly, at v = -2/3 a magnetic field induces a fractional Chern insulator accompanied by an insulator-metal transition. Our results broaden the topological phase diagram of tMoTe2 and establish large-angle moire superlattices as a versatile platform for engineering robust topological states beyond the strong-correlation limit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_16374 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Observation of a Reconstructed Chern Insulator in Twisted Bilayer MoTe2 Wu, Min Li, Lingxiao Ouyang, Yunze Jiang, Yifan Qiu, Wenxuan Zhang, Zaizhe Huo, Zihao Yang, Qiu Tian, Ming Wan, Neng Watanabe, Kenji Taniguchi, Takashi Lei, Shiming Wu, Fengcheng Lu, Xiaobo Mesoscale and Nanoscale Physics Twisted bilayer MoTe2 is a prototypical moire material in which long-wavelength superlattices amplify electron correlations, enabling a wealth of emergent quantum phases. To date, experimental efforts have focused primarily on small twist angles (typically smaller than 4deg ), whereas the larger-angle regime-where moire bands become more dispersive and correlations are reduced-has remained largely unexplored. Here we chart the topological phase space of tMoTe2 at a relatively large twist angle of approximately 4.54deg, accessing a moderately correlated regime with enhanced bandwidth. In contrast to small-angle devices that predominantly host fractional quantum anomalous Hall or spin Hall responses, we uncover multiple Chern-insulating states with C = 1 at moire fillings v = -1, -0.53 and -1/2. Strikingly, at v = -2/3 a magnetic field induces a fractional Chern insulator accompanied by an insulator-metal transition. Our results broaden the topological phase diagram of tMoTe2 and establish large-angle moire superlattices as a versatile platform for engineering robust topological states beyond the strong-correlation limit. |
| title | Observation of a Reconstructed Chern Insulator in Twisted Bilayer MoTe2 |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2603.16374 |