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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.04561 |
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| _version_ | 1866912877230686208 |
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| author | Pan, Haiyang Yang, Shunshun Wang, Yuzhu Cai, Xiangbin Wang, Wei Zhao, Yan Watanabe, Kenji Taniguchi, Takashi Zhang, Linlong Liu, Youwen Yang, Bo Gao, Weibo |
| author_facet | Pan, Haiyang Yang, Shunshun Wang, Yuzhu Cai, Xiangbin Wang, Wei Zhao, Yan Watanabe, Kenji Taniguchi, Takashi Zhang, Linlong Liu, Youwen Yang, Bo Gao, Weibo |
| contents | The discovery of fractional charge excitations in new platforms offers crucial insights into strongly correlated quantum phases. While a range of fractional quantum anomalous Hall (FQAH) states have recently been observed in two-dimensional twisted moire systems, the theoretically anticipated filling factor v = -1/3 FQAH state has remained elusive, with debates centering on its nature of charge density wave or a topological Chern insulator. Here, we report the optical detection of a v = -1/3 FQAH state in twisted MoTe2 bilayers. Using photoluminescence (PL) and reflective magnetic circular dichroism (RMCD) techniques, we identify ferromagnetic states at filling factors v = -1, -2/3, and -1/3, all tunable by a vertical electric field. The corresponding Curie temperatures are approximately 11 K, 3.5 K, and 2.4 K, respectively. The -1/3 state emerges over a narrower electric field range and a lower temperature compared to the integer and other fractional states, indicating its fragile nature that may lead to its absence in previous reports. Notably, the PL spectra at v = -1/3 disperse as the out-of-plane magnetic field increases, consistent with a nontrivial topological origin. Theoretical calculations based on the exact diagonalization method further support the interpretation of this topologically non-trivial state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_04561 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Optical signatures of -1/3 fractional quantum anomalous Hall state in twisted MoTe2 Pan, Haiyang Yang, Shunshun Wang, Yuzhu Cai, Xiangbin Wang, Wei Zhao, Yan Watanabe, Kenji Taniguchi, Takashi Zhang, Linlong Liu, Youwen Yang, Bo Gao, Weibo Mesoscale and Nanoscale Physics The discovery of fractional charge excitations in new platforms offers crucial insights into strongly correlated quantum phases. While a range of fractional quantum anomalous Hall (FQAH) states have recently been observed in two-dimensional twisted moire systems, the theoretically anticipated filling factor v = -1/3 FQAH state has remained elusive, with debates centering on its nature of charge density wave or a topological Chern insulator. Here, we report the optical detection of a v = -1/3 FQAH state in twisted MoTe2 bilayers. Using photoluminescence (PL) and reflective magnetic circular dichroism (RMCD) techniques, we identify ferromagnetic states at filling factors v = -1, -2/3, and -1/3, all tunable by a vertical electric field. The corresponding Curie temperatures are approximately 11 K, 3.5 K, and 2.4 K, respectively. The -1/3 state emerges over a narrower electric field range and a lower temperature compared to the integer and other fractional states, indicating its fragile nature that may lead to its absence in previous reports. Notably, the PL spectra at v = -1/3 disperse as the out-of-plane magnetic field increases, consistent with a nontrivial topological origin. Theoretical calculations based on the exact diagonalization method further support the interpretation of this topologically non-trivial state. |
| title | Optical signatures of -1/3 fractional quantum anomalous Hall state in twisted MoTe2 |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2602.04561 |