Independently Tunable Flat Bands and Correlations in a Graphene Double Moiré System
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.
Authors
- Allan H. MacDonald (ORCID: https://orcid.org/0000-0003-3561-3379)
- G. William Burg (ORCID: https://orcid.org/0000-0002-5292-7719)
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
- Anand Swain
- Yuebing Zheng (ORCID: https://orcid.org/0000-0002-9168-9477)
- Emanuel Tutuc (ORCID: https://orcid.org/0000-0003-3516-1659)
- Jihang Zhu (ORCID: https://orcid.org/0000-0002-0297-3012)
- Yimeng Wang (ORCID: https://orcid.org/0000-0001-6409-8412)
Institutions
- Instituto de Ciencia de Materiales de Sevilla (ES)
- The University of Texas at Austin (US)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-03-07
- DOI
- https://doi.org/10.1103/physrevlett.134.096204
- Citations
- 2
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 1.04
Funders
- National Science Foundation
- U.S. Department of Energy
- Welch Foundation
- Army Research Office