Fractionalization and Entanglement of High Chern Insulators
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arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915694148321280 |
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| author | Li, Zexu Wang, Wenxuan Wang, Fajie Zhang, Zaizhe Yang, Qiu Watanabe, Kenji Taniguchi, Takashi Xie, X. C. Wang, Jie Liu, Kaihui Song, Zhida Lu, Xiaobo |
| author_facet | Li, Zexu Wang, Wenxuan Wang, Fajie Zhang, Zaizhe Yang, Qiu Watanabe, Kenji Taniguchi, Takashi Xie, X. C. Wang, Jie Liu, Kaihui Song, Zhida Lu, Xiaobo |
| contents | The realization of fractional Chern insulators opens up the possibility of exploring fractionally charged excitations and anyonic statistics in the absence of a magnetic field. One of the central questions is whether lattice-based systems can give rise to radically new states, distinct from those observed in traditional fractional quantum Hall systems. In this work, we investigate a new type of moire flat band system composed of Bernal bilayer graphene and rhombohedral tetralayer graphene. First, we discover an unprecedented richness of states with high Chern numbers. At v = 1 moire filling, we observe Chern insulators with Chern numbers C = 4 and 3. Flanking v = 3 state, we observe a series of Chern insulators from C = 2 to C = 7. All of these states exhibit the quantum anomalous Hall effect. Remarkably, we observe an exotic fractional Chern insulator with C = 7/3 around v = 2/3 which is beyond all known fractional Chern insulators described by either the Jain sequence as or current high Chern theory. Our work expands the understanding of fractionally charged excitations beyond the Landau level basis and offers a new moiré platform for exploring anyons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_21612 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fractionalization and Entanglement of High Chern Insulators Li, Zexu Wang, Wenxuan Wang, Fajie Zhang, Zaizhe Yang, Qiu Watanabe, Kenji Taniguchi, Takashi Xie, X. C. Wang, Jie Liu, Kaihui Song, Zhida Lu, Xiaobo Mesoscale and Nanoscale Physics The realization of fractional Chern insulators opens up the possibility of exploring fractionally charged excitations and anyonic statistics in the absence of a magnetic field. One of the central questions is whether lattice-based systems can give rise to radically new states, distinct from those observed in traditional fractional quantum Hall systems. In this work, we investigate a new type of moire flat band system composed of Bernal bilayer graphene and rhombohedral tetralayer graphene. First, we discover an unprecedented richness of states with high Chern numbers. At v = 1 moire filling, we observe Chern insulators with Chern numbers C = 4 and 3. Flanking v = 3 state, we observe a series of Chern insulators from C = 2 to C = 7. All of these states exhibit the quantum anomalous Hall effect. Remarkably, we observe an exotic fractional Chern insulator with C = 7/3 around v = 2/3 which is beyond all known fractional Chern insulators described by either the Jain sequence as or current high Chern theory. Our work expands the understanding of fractionally charged excitations beyond the Landau level basis and offers a new moiré platform for exploring anyons. |
| title | Fractionalization and Entanglement of High Chern Insulators |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2512.21612 |