Weak-coupling theory of magic-angle twisted bilayer graphene
Strong correlations occur in magic-angle twisted bilayer graphene (MATBG) when the octet of flat moiré minibands centered on charge neutrality (CN) is partially occupied. The octet consists of a single valence band and a single conduction band for each of four degenerate spin-valley flavors. Motivated by the importance of Hartree electrostatic interactions in determining the filling-factor-dependent band structure, we use a time-dependent Hartree approximation to gain insight into electronic correlations. We find that the electronic compressibility is dominated by Hartree interactions, that paramagnetic states are stable over a range of density near CN, and that the dependence of energy on flavor polarization is strongly overestimated by mean-field theory. Published by the American Physical Society 2024
Authors
- Marco Polini (ORCID: https://orcid.org/0000-0003-2217-7408)
- Iacopo Torre (ORCID: https://orcid.org/0000-0001-6515-181X)
- Allan H. MacDonald (ORCID: https://orcid.org/0000-0003-3561-3379)
- Jihang Zhu (ORCID: https://orcid.org/0000-0002-0297-3012)
Institutions
- University of Pisa (IT)
- Italian Institute of Technology (IT)
- Max Planck Institute for the Physics of Complex Systems (DE)
- Barcelona Institute of Science and Technology (ES)
- Joint Quantum Institute (US)
- Institute of Science and Technology
- University of Maryland, College Park (US)
- The University of Texas at Austin (US)
Publication Details
- Journal
- Physical review. B./Physical review. B
- Published
- 2024-09-20
- DOI
- https://doi.org/10.1103/physrevb.110.l121117
- Citations
- 9
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 1.05
Funders
- U.S. Department of Energy
- University of Texas at Austin
- Ministero dell'Università e della Ricerca
- Office of Science
- Horizon 2020 Framework Programme
- Basic Energy Sciences
- HORIZON EUROPE Marie Sklodowska-Curie Actions