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説明:

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 intermoiré 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.

権利情報:

• In Copyright
  

  © 2025 American Physical Society

キーワード: Twisted triple bilayer graphene, Moiré superlattices, Berry curvature

刊行年月日: 2025-04-23

出版者: American Physical Society (APS)

掲載誌:

• Physical Review B (ISSN: 1550235X) vol. 111 issue. 16 L161120

研究助成金:

• Japan Society for the Promotion of Science 20H00354
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Ministry of Education, Culture, Sports, Science and Technology
• National Science Foundation DMR-1922165
• National Science Foundation DMR-1922172
• National Science Foundation ECCS-2025124
• Simons Foundation 896626

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1103/PhysRevB.111.L161120

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更新時刻: 2026-07-06 09:15:33 +0900

MDRでの公開時刻: 2026-07-06 10:29:07 +0900