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| Päätekijät: | , , , , , , , , , , |
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| Aineistotyyppi: | Preprint |
| Julkaistu: |
2024
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| Aiheet: | |
| Linkit: | https://arxiv.org/abs/2408.05708 |
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| _version_ | 1866908348137340928 |
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| author | Davydov, Konstantin Zhu, Ziyan Friedman, Noah Gramowski, Ethan Li, Yaotian Tavakley, Jack Watanabe, Kenji Taniguchi, Takashi Luskin, Mitchell Kaxiras, Efthimios Wang, Ke |
| author_facet | Davydov, Konstantin Zhu, Ziyan Friedman, Noah Gramowski, Ethan Li, Yaotian Tavakley, Jack Watanabe, Kenji Taniguchi, Takashi Luskin, Mitchell Kaxiras, Efthimios Wang, Ke |
| contents | We report a twisted triple bilayer graphene platform consisting of three units of Bernal bilayer graphene consecutively twisted at 1.49° and 1.68°. We demonstrate the atomic reconstruction between the two competing moiré superlattices strongly enhances the Berry curvature of each moiré band insulator state, characterized by measured strong nonlocal valley Hall effect that sensitively depends on the inter-moiré competition strength, tunable by manipulating the out-of-plane carrier distribution. Our study sheds light on the microscopic mechanism of atomic and electronic reconstruction in twisted multilayer systems, by systematically investigating transport signatures of moiré Berry curvature and its enhancement from moiré-of-moiré lattice reconstruction. We show that the reconstructed electronic band can be versatilely tuned by electrostatics, providing an approach toward engineering the band structure and its topology for a quantum material platform with designer electrical and optical properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_05708 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tunable atomically enhanced moiré Berry curvatures in twisted triple bilayer graphene Davydov, Konstantin Zhu, Ziyan Friedman, Noah Gramowski, Ethan Li, Yaotian Tavakley, Jack Watanabe, Kenji Taniguchi, Takashi Luskin, Mitchell Kaxiras, Efthimios Wang, Ke Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons We report a twisted triple bilayer graphene platform consisting of three units of Bernal bilayer graphene consecutively twisted at 1.49° and 1.68°. We demonstrate the atomic reconstruction between the two competing moiré superlattices strongly enhances the Berry curvature of each moiré band insulator state, characterized by measured strong nonlocal valley Hall effect that sensitively depends on the inter-moiré competition strength, tunable by manipulating the out-of-plane carrier distribution. Our study sheds light on the microscopic mechanism of atomic and electronic reconstruction in twisted multilayer systems, by systematically investigating transport signatures of moiré Berry curvature and its enhancement from moiré-of-moiré lattice reconstruction. We show that the reconstructed electronic band can be versatilely tuned by electrostatics, providing an approach toward engineering the band structure and its topology for a quantum material platform with designer electrical and optical properties. |
| title | Tunable atomically enhanced moiré Berry curvatures in twisted triple bilayer graphene |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.05708 |