Electron-phonon coupling and competing Kekulé orders in twisted bilayer graphene
Magic-angle twisted bilayer graphene has attracted significant attention for its strongly correlated phenomena. Recent scanning tunneling experiments have measured graphene-scale Kekul\'e charge ordering in some of the correlated insulators and nearby metallic phases. While most of these can be explained by the strain-induced incommensurate Kekul\'e spiral phase, the presence of Kekul\'e ordering in ultralow strain devices is unexpected within the existing theory. Using Hartree-Fock and strong-coupling calculations, the authors show that such observations can be rationalized by invoking electron-phonon coupling to zone-corner graphene phonons.
Authors
- Yves H. Kwan (ORCID: https://orcid.org/0000-0001-6479-5584)
- S. A. Parameswaran (ORCID: https://orcid.org/0000-0002-5055-5528)
- Nick Bultinck (ORCID: https://orcid.org/0000-0002-2781-4085)
- Glenn Wagner (ORCID: https://orcid.org/0000-0003-3154-8995)
- Steven H. Simon (ORCID: https://orcid.org/0000-0001-7757-5978)
- Erez Berg (ORCID: https://orcid.org/0000-0001-8956-3384)
Institutions
- Princeton University (US)
- University of Zurich (CH)
- Ghent University Hospital (BE)
- Ghent University (BE)
- Science Oxford (GB)
- Weizmann Institute of Science (IL)
Publication Details
- Journal
- Physical review. B./Physical review. B
- Published
- 2024-08-29
- DOI
- https://doi.org/10.1103/physrevb.110.085160
- Citations
- 22
- Primary Topic
- Graphene research and applications
- Type
- article
- Field-Weighted Citation Impact
- 2.46
Funders
- Engineering and Physical Sciences Research Council
- H2020 European Research Council