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Superlattice-Induced Insulating States and Valley-Protected Orbits in Twisted Bilayer Graphene
Open accessAbstract
Twisted bilayer graphene (TBLG) is one of the simplest van der Waals heterostructures, yet it yields a complex electronic system with intricate interplay between moiré physics and interlayer hybridization effects. We report on electronic transport measurements of high mobility small angle TBLG devices showing clear evidence for insulating states at the superlattice band edges, with thermal activation gaps several times larger than theoretically predicted. Moreover, Shubnikov-de Haas oscillations and tight binding calculations reveal that the band structure consists of two intersecting Fermi contours whose crossing points are effectively unhybridized. We attribute this to exponentially suppressed interlayer hopping amplitudes for momentum transfers larger than the moiré wave vector.
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Cites
Magnetic Oscillations in Metals
Shoenberg, D. (1984) · doi:10.1017/cbo9780511897870 · Cited by 2,328
Cited by
Correlated insulator behaviour at half-filling in magic-angle graphene superlattices
Cao, Y., Fatemi, V., Demir, A., Fang, S., Tomarken, S. L., Luo, J. Y., Sanchez-Yamagishi, J. D., Watanabe, K., Taniguchi, T., Kaxiras, E., et al. (2018) · Nature · doi:10.1038/nature26154 · Cited by 4,858
Self-citationTunable correlated states and spin-polarized phases in twisted bilayer–bilayer graphene
Cao, Y., Rodan-Legrain, D., Rubies-Bigorda, O., Park, J. M., Watanabe, K., Taniguchi, T., & Jarillo-Herrero, P. (2020) · Nature · doi:10.1038/s41586-020-2260-6 · Cited by 668
Self-citationFractional Chern insulators in magic-angle twisted bilayer graphene
Xie, Y., Pierce, A. T., Park, J. M., Parker, D. E., Khalaf, E., Ledwith, P., Cao, Y., Lee, S. H., Chen, S., Forrester, P. R., et al. (2021) · Nature · doi:10.1038/s41586-021-04002-3 · Cited by 523
Self-citationFaithful tight-binding models and fragile topology of magic-angle bilayer graphene
Po, H. C., Zou, L., Senthil, T., & Vishwanath, A. (2019) · Physical Review B · doi:10.1103/physrevb.99.195455 · Cited by 394
Excitonic devices with van der Waals heterostructures: valleytronics meets twistronics
Ciarrocchi, A., Tagarelli, F., Avsar, A., & Kis, A. (2022) · Nature Reviews Materials · doi:10.1038/s41578-021-00408-7 · Cited by 291
Metadata
- Authors
- Cao, Y., Luo, J. Y., Fatemi, V., Fang, S., Sanchez-Yamagishi, J. D., Watanabe, K., Taniguchi, T., Kaxiras, E., & Jarillo-Herrero, P.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2016-09-07
- Volume
- 117
- Issue
- 11
- Pages
- 116804-116804
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2512054889
- Cited by
- 422
- References
- 1
- FWCI
- 14.26
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Cao, Y., Luo, J. Y., Fatemi, V., Fang, S., Sanchez-Yamagishi, J. D., Watanabe, K., Taniguchi, T., Kaxiras, E., & Jarillo-Herrero, P. (2016). Superlattice-Induced Insulating States and Valley-Protected Orbits in Twisted Bilayer Graphene. Physical Review Letters. https://doi.org/10.1103/physrevlett.117.116804
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