Flat Band and Many-body Gap in Chirally Twisted Triple Bilayer Graphene
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arXiv
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| Hauptverfasser: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916563038240768 |
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| author | Lin, Wenlu Wang, Wenxuan Cao, Shimin Liang, Miao Zhao, Lili Watanabe, Kenji Taniguchi, Takashi Gao, Jinhua Chen, Jianhao Lu, Xiaobo Liu, Yang |
| author_facet | Lin, Wenlu Wang, Wenxuan Cao, Shimin Liang, Miao Zhao, Lili Watanabe, Kenji Taniguchi, Takashi Gao, Jinhua Chen, Jianhao Lu, Xiaobo Liu, Yang |
| contents | We experimentally investigate the band structures of chirally twisted triple bilayer graphene. The new kind of moiré structure, formed by three pieces of helically stacked Bernal bilayer graphene, has flat bands at charge neutral point based on the continuum approximation. We experimentally confirm the existence of flat bands and directly acquire the gap in-between flat bands as well as between the flat bands and dispersive bands from the capacitance measurements. We discover a finite gap even at zero perpendicular electric field, possibly induced by the Coulomb interaction and ferromagnetism. Our quantitative study not only provides solid evidence for the flat-band and interesting physics, but also introduces a quantitative approach to explore phenomena of similar moiré systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_06852 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Flat Band and Many-body Gap in Chirally Twisted Triple Bilayer Graphene Lin, Wenlu Wang, Wenxuan Cao, Shimin Liang, Miao Zhao, Lili Watanabe, Kenji Taniguchi, Takashi Gao, Jinhua Chen, Jianhao Lu, Xiaobo Liu, Yang Mesoscale and Nanoscale Physics We experimentally investigate the band structures of chirally twisted triple bilayer graphene. The new kind of moiré structure, formed by three pieces of helically stacked Bernal bilayer graphene, has flat bands at charge neutral point based on the continuum approximation. We experimentally confirm the existence of flat bands and directly acquire the gap in-between flat bands as well as between the flat bands and dispersive bands from the capacitance measurements. We discover a finite gap even at zero perpendicular electric field, possibly induced by the Coulomb interaction and ferromagnetism. Our quantitative study not only provides solid evidence for the flat-band and interesting physics, but also introduces a quantitative approach to explore phenomena of similar moiré systems. |
| title | Flat Band and Many-body Gap in Chirally Twisted Triple Bilayer Graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2501.06852 |