Independently Tunable Flat Bands and Correlations in a Graphene Double Moiré System
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866912299849089024 |
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| author | Wang, Yimeng Zhu, Jihang Burg, G. William Swain, Anand Watanabe, Kenji Taniguchi, Takashi Zheng, Yuebing MacDonald, Allan H. Tutuc, Emanuel |
| author_facet | Wang, Yimeng Zhu, Jihang Burg, G. William Swain, Anand Watanabe, Kenji Taniguchi, Takashi Zheng, Yuebing MacDonald, Allan H. Tutuc, Emanuel |
| contents | We report on a double moiré system consisting of four graphene layers, where the top and bottom pairs form small-twist-angle bilayer graphene, and the middle interface has a large rotational mismatch. This system shows clear signatures of two sets of spatially separated flat bands associated with the top and bottom twisted bilayer graphene (TBG) subsystems, each independently tunable. Thermodynamic analysis reveals weak correlations between layers that allow the chemical potential to be measured as a function of carrier density for each constituent TBG. We find that correlated insulating states at integer number of electrons per moiré unit cell are most robust near magic angle, whereas gapped states at neutrality are more robust at larger twist angles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_18785 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Independently Tunable Flat Bands and Correlations in a Graphene Double Moiré System Wang, Yimeng Zhu, Jihang Burg, G. William Swain, Anand Watanabe, Kenji Taniguchi, Takashi Zheng, Yuebing MacDonald, Allan H. Tutuc, Emanuel Mesoscale and Nanoscale Physics We report on a double moiré system consisting of four graphene layers, where the top and bottom pairs form small-twist-angle bilayer graphene, and the middle interface has a large rotational mismatch. This system shows clear signatures of two sets of spatially separated flat bands associated with the top and bottom twisted bilayer graphene (TBG) subsystems, each independently tunable. Thermodynamic analysis reveals weak correlations between layers that allow the chemical potential to be measured as a function of carrier density for each constituent TBG. We find that correlated insulating states at integer number of electrons per moiré unit cell are most robust near magic angle, whereas gapped states at neutrality are more robust at larger twist angles. |
| title | Independently Tunable Flat Bands and Correlations in a Graphene Double Moiré System |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2411.18785 |