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Description:

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 subsystems, each independently tunable. Thermodynamic analysis reveals weak correlations between bilayers 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.

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• In Copyright
  

  © 2025 American Physical Society

Keyword: Moiré system, Twisted bilayer graphene (TBG), Flat bands

Date published: 2025-03-07

Publisher: American Physical Society (APS)

Journal:

• Physical Review Letters (ISSN: 10797114) vol. 134 issue. 9 096204

Funding:

• National Science Foundation MRSEC DMR-2308817
• National Science Foundation EECS-2122476
• National Science Foundation 2140985
• Army Research Office W911NF-22-1-2
• Welch Foundation F-2169-20230405
• U.S. Department of Energy DE-SC0019481

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1103/PhysRevLett.134.096204

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Updated at: 2026-07-06 10:43:43 +0900

Published on MDR: 2026-07-06 12:30:03 +0900