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Evidence for Interlayer Coupling and Moiré Periodic Potentials in Twisted Bilayer Graphene
Abstract
We report a study of the valence band dispersion of twisted bilayer graphene using angle-resolved photoemission spectroscopy and ab initio calculations. We observe two noninteracting cones near the Dirac crossing energy and the emergence of van Hove singularities where the cones overlap for large twist angles (>5°). Besides the expected interaction between the Dirac cones, minigaps appeared at the Brillouin zone boundaries of the moiré superlattice formed by the misorientation of the two graphene layers. We attribute the emergence of these minigaps to a periodic potential induced by the moiré. These anticrossing features point to coupling between the two graphene sheets, mediated by moiré periodic potentials.
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Cites
Self-interaction correction to density-functional approximations for many-electron systems
Perdew, J. P., & Zunger, A. (1981) · Physical Review B · doi:10.1103/physrevb.23.5048 · Cited by 20,887
Electronic properties of two-dimensional systems
Ando, T., Fowler, A. B., & Stern, F. (1982) · Reviews of Modern Physics · doi:10.1103/revmodphys.54.437 · Cited by 7,455
Cited by
Electronic correlations in twisted bilayer graphene near the magic angle
Choi, Y., Kemmer, J., Peng, Y., Thomson, A., Arora, H., Polski, R., Zhang, Y., Ren, H., Alicea, J., Refael, G., et al. (2019) · Nature Physics · doi:10.1038/s41567-019-0606-5 · Cited by 676
Optical absorption in twisted bilayer graphene
Moon, P., & Koshino, M. (2013) · Physical Review B · doi:10.1103/physrevb.87.205404 · Cited by 493
Superlattice-Induced Insulating States and Valley-Protected Orbits in Twisted Bilayer Graphene
Cao, Y., Luo, J. Y., Fatemi, V., Fang, S., Sanchez-Yamagishi, J. D., Watanabe, K., Taniguchi, T., Kaxiras, E., & Jarillo-Herrero, P. (2016) · Physical Review Letters · doi:10.1103/physrevlett.117.116804 · Cited by 422
Chiral Spin Density Wave and d+id Superconductivity in the Magic-Angle-Twisted Bilayer Graphene
Liu, C.-C., Zhang, L.-D., Chen, W.-Q., & Yang, F. (2018) · Physical Review Letters · doi:10.1103/physrevlett.121.217001 · Cited by 292
Metadata
- Authors
- Ohta, T., Robinson, J. T., Feibelman, P. J., Bostwick, A., Rotenberg, E., & Beechem, T. E.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2012-11-02
- Volume
- 109
- Issue
- 18
- Pages
- 186807-186807
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2061454748
- Cited by
- 213
- References
- 2
- FWCI
- 7.10
- Type
- journal article
- Language
- en
- Open access
- closed
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- Ohta, T., Robinson, J. T., Feibelman, P. J., Bostwick, A., Rotenberg, E., & Beechem, T. E. (2012). Evidence for Interlayer Coupling and Moiré Periodic Potentials in Twisted Bilayer Graphene. Physical Review Letters. https://doi.org/10.1103/physrevlett.109.186807
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