Programmable Quantum Anomalous Hall Insulator in Twisted Crystalline Flatbands
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914237031383040 |
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| author | Wang, Wenxuan Wang, Yijie Zhang, Zaizhe Huo, Zihao Zhou, Gengdong Watanabe, Kenji Taniguchi, Takashi Xie, X. C. Liu, Kaihui Song, Zhida Lu, Xiaobo |
| author_facet | Wang, Wenxuan Wang, Yijie Zhang, Zaizhe Huo, Zihao Zhou, Gengdong Watanabe, Kenji Taniguchi, Takashi Xie, X. C. Liu, Kaihui Song, Zhida Lu, Xiaobo |
| contents | The isospin flavors in condensed matters can be continuously broken, forming various symmetry-broken quantum states. In moiré crystals, the competition between different isospin configurations can be effectively tuned by the twist angles and staciking orders. Here we report twisted double rhombohedral-trilayer-gaphene as a new twisted crystalline flatbands system showing rich moiré dependent topological phenomena. In devices with small twist angles, programmable Chern insulators with Chern number C = 3 at integer moiré filling v = 1 have been observed. We have further revealed an exotic hidden order which can quench the Chern insulator as well as multiple first-order transitions between different symmetry-broken phases. Interestly, in the device with a slightly larger twist angle, multiple Chern insulators with C = 1 at fractional moiré fillings including v = 1/4, 1/3 and 1/2 have been observed, whereas the Chern insulator at v = 1 is abscent. Our study demonstrated the twisted flatbands form rhombohedral-multilayer-graphene as a new platform to study tunable high Chern insulators as well as new devices for quantum storage and computation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_10875 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Programmable Quantum Anomalous Hall Insulator in Twisted Crystalline Flatbands Wang, Wenxuan Wang, Yijie Zhang, Zaizhe Huo, Zihao Zhou, Gengdong Watanabe, Kenji Taniguchi, Takashi Xie, X. C. Liu, Kaihui Song, Zhida Lu, Xiaobo Mesoscale and Nanoscale Physics Strongly Correlated Electrons The isospin flavors in condensed matters can be continuously broken, forming various symmetry-broken quantum states. In moiré crystals, the competition between different isospin configurations can be effectively tuned by the twist angles and staciking orders. Here we report twisted double rhombohedral-trilayer-gaphene as a new twisted crystalline flatbands system showing rich moiré dependent topological phenomena. In devices with small twist angles, programmable Chern insulators with Chern number C = 3 at integer moiré filling v = 1 have been observed. We have further revealed an exotic hidden order which can quench the Chern insulator as well as multiple first-order transitions between different symmetry-broken phases. Interestly, in the device with a slightly larger twist angle, multiple Chern insulators with C = 1 at fractional moiré fillings including v = 1/4, 1/3 and 1/2 have been observed, whereas the Chern insulator at v = 1 is abscent. Our study demonstrated the twisted flatbands form rhombohedral-multilayer-graphene as a new platform to study tunable high Chern insulators as well as new devices for quantum storage and computation. |
| title | Programmable Quantum Anomalous Hall Insulator in Twisted Crystalline Flatbands |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.10875 |