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Topologically Protected Helical States in Minimally Twisted Bilayer Graphene
Open accessAbstract
In minimally twisted bilayer graphene, a moiré pattern consisting of AB and BA stacking regions separated by domain walls forms. These domain walls are predicted to support counterpropogating topologically protected helical (TPH) edge states when the AB and BA regions are gapped. We fabricate designer moiré crystals with wavelengths longer than 50 nm and demonstrate the emergence of TPH states on the domain wall network by scanning tunneling spectroscopy measurements. We observe a double-line profile of the TPH states on the domain walls, only occurring when the AB and BA regions are gapped. Our results demonstrate a practical and flexible method for TPH state network construction.
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Cites
Biased Bilayer Graphene: Semiconductor with a Gap Tunable by the Electric Field Effect
Castro, E. V., Novoselov, K. S., Morozov, S. V., Peres, N. M. R., dos Santos, J. M. B. L., Nilsson, J., Guinea, F., Geim, A. K., & Neto, A. H. C. (2007) · Physical Review Letters · doi:10.1103/physrevlett.99.216802 · Cited by 2,033
Topological valley transport at bilayer graphene domain walls
Ju, L., Shi, Z., Nair, N., Lv, Y., Jin, C., Velasco, J., Ojeda-Aristizabal, C., Bechtel, H. A., Martin, M. C., Zettl, A., et al. (2015) · Nature · doi:10.1038/nature14364 · Cited by 680
Cited by
Faithful 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
Electronic-structure methods for twisted moiré layers
Carr, S., Fang, S., & Kaxiras, E. (2020) · Nature Reviews Materials · doi:10.1038/s41578-020-0214-0 · Cited by 303
WS2 moiré superlattices derived from mechanical flexibility for hydrogen evolution reaction
Xie, L., Wang, L., Zhao, W., Liu, S., Huang, W., & Zhao, Q. (2021) · Nature Communications · doi:10.1038/s41467-021-25381-1 · Cited by 240
Metadata
- Authors
- Huang, S., Kim, K., Efimkin, D. K., Lovorn, T., Taniguchi, T., Watanabe, K., MacDonald, A. H., Tutuc, E., & LeRoy, B. J.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2018-07-17
- Volume
- 121
- Issue
- 3
- Pages
- 037702-037702
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2884059598
- Cited by
- 254
- References
- 2
- FWCI
- 14.72
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Huang, S., Kim, K., Efimkin, D. K., Lovorn, T., Taniguchi, T., Watanabe, K., MacDonald, A. H., Tutuc, E., & LeRoy, B. J. (2018). Topologically Protected Helical States in Minimally Twisted Bilayer Graphene. Physical Review Letters. https://doi.org/10.1103/physrevlett.121.037702
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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