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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.

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• In Copyright
  

  © 2025 American Physical Society

Keyword: Twisted triple bilayer graphene, Moiré superlattices, Berry curvature

Date published: 2025-04-23

Publisher: American Physical Society (APS)

Journal:

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

Funding:

• 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

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1103/PhysRevB.111.L161120

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Updated at: 2026-07-06 09:15:33 +0900

Published on MDR: 2026-07-06 10:29:07 +0900