The DOI matches its Crossref record; 49 of the 49 references it cites were found in a registry or an index.
Correlated states in twisted double bilayer graphene
Open accessAbstract
Electron–electron interactions play an important role in graphene and related systems and can induce exotic quantum states, especially in a stacked bilayer with a small twist angle 1 – 7 . For bilayer graphene where the two layers are twisted by the ‘magic angle’, flat band and strong many-body effects lead to correlated insulating states and superconductivity 4 – 7 . In contrast to monolayer graphene, the band structure of untwisted bilayer graphene can be further tuned by a displacement field 8 – 10 , providing an extra degree of freedom to control the flat band that should appear when two bilayers are stacked on top of each other. Here, we report the discovery and characterization of displacement field-tunable electronic phases in twisted double bilayer graphene. We observe insulating states at a half-filled conduction band in an intermediate range of displacement fields. Furthermore, the resistance gap in the correlated insulator increases with respect to the in-plane magnetic fields and we find that the g factor, according to the spin Zeeman effect, is ~2, indicating spin polarization at half-filling. These results establish twisted double bilayer graphene as an easily tunable platform for exploring quantum many-body states. Placing two Bernal-stacked graphene bilayers on top of each other with a small twist angle gives correlated states. As the band structure can be tuned by an electric field, this platform is a more varied setting to study correlated electrons.
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Cites
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Self-citationSimplified LCAO Method for the Periodic Potential Problem
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Self-citationTuning superconductivity in twisted bilayer graphene
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Superconductivity and strong correlations in moiré flat bands
Balents, L., Dean, C. R., Efetov, D. K., & Young, A. F. (2020) · Nature Physics · doi:10.1038/s41567-020-0906-9 · Cited by 871
Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene
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Self-citationCascade of electronic transitions in magic-angle twisted bilayer graphene
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Self-citationVan der Waals heterostructures
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Quantum criticality in twisted transition metal dichalcogenides
Ghiotto, A., Shih, E.-M., Pereira, G. S. S. G., Rhodes, D. A., Kim, B., Zang, J., Millis, A. J., Watanabe, K., Taniguchi, T., Hone, J. C., et al. (2021) · Nature · doi:10.1038/s41586-021-03815-6 · Cited by 312
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Metadata
- Authors
- Shen, C., Chu, Y., Wu, Q., Li, N., Wang, S., Zhao, Y., Tang, J., Liu, J., Tian, J., Watanabe, K., Taniguchi, T., Yang, R., Meng, Z. Y., Shi, D., Yazyev, O. V., & Zhang, G.
- Venue
- Nature Physics
- Published
- 2020-03-30
- Volume
- 16
- Issue
- 5
- Pages
- 520-525
- ISSN
- 1745-2473 (ISSN-L)
- 1745-2481
- OpenAlex
- W3013034951
- Cited by
- 531
- References
- 49
- FWCI
- 35.80
- Type
- journal article
- Language
- en
- Open access
- green
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