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Abstract
Diverse emergent correlated electron phenomena have been observed in twisted-graphene layers. Many electronic structure predictions have been reported exploring this new field, but with few momentum-resolved electronic structure measurements to test them. We use angle-resolved photoemission spectroscopy to study the twist-dependent (1° < θ < 8°) band structure of twisted-bilayer, monolayer-on-bilayer, and double-bilayer graphene (tDBG). Direct comparison is made between experiment and theory, using a hybrid k·p model for interlayer coupling. Quantitative agreement is found across twist angles, stacking geometries, and back-gate voltages, validating the models and revealing field-induced gaps in twisted graphenes. However, for tDBG at θ = 1.5 ± 0.2°, close to the magic angle θ = 1.3°, a flat band is found near the Fermi level with measured bandwidth Ew = 31 ± 5 meV. An analysis of the gap between the flat band and the next valence band shows deviations between experiment (Δh = 46 ± 5 meV) and theory (Δh = 5 meV), indicative of lattice relaxation in this regime.
Original language | English |
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Pages (from-to) | 5201-5208 |
Number of pages | 8 |
Journal | Nano Letters |
Volume | 23 |
Issue number | 11 |
Early online date | 26 May 2023 |
DOIs | |
Publication status | Published - 14 Jun 2023 |
Keywords
- angle-resolved photoemission spectroscopy
- flat band
- graphene
- twistronics, moiré
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Dive into the research topics of 'ARPES Signatures of Few-Layer Twistronic Graphenes'. Together they form a unique fingerprint.Projects
- 1 Active
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CDT in Science and Applications of Graphene and Related Nanomaterial
Grigorieva, I. (PI), Burnett, H. (PGR student), Cusworth, E. (PGR student), Deaconu, D.-A. (PGR student), Dumitriu-Iovanescu, A.-D. (PGR student), Kang, Y.-W. (PGR student), Little, J. (PGR student), Rees, E. (PGR student), Selles, F. (PGR student), Shaker, M. (PGR student), Soong, Y.-C. (PGR student), Swindell, J. (PGR student), Tainton, G. (PGR student), Wood, H. (PGR student), Astles, T. (PGR student), Carl, A. (PGR student), Chen, G. (PGR student), Richard De Latour, H. (PGR student), Dowinton, O. (PGR student), Haskell, S. (PGR student), Hills, K. (PGR student), Hoole, C. (PGR student), Huang, Y. (PGR student), Kalsi, T. (PGR student), Powell, L. (PGR student), Quiligotti, K. (PGR student), Rimmer, J. (PGR student), Smith, L. (PGR student), Thornley, W. (PGR student), Yang, J. (PGR student), Young, W. (PGR student), Zhao, M. (PGR student), Al Busaidi, R. (PGR student), Al Ruqeishi, E. (PGR student), Chadha, A. (PGR student), Chen, M. (PGR student), Dennis, G. (PGR student), Dunn, E. (PGR student), Gamblen, E. (PGR student), Gao, Y. (PGR student), Georgantas, Y. (PGR student), Jiang, Z. (PGR student), Karakasidi, A. (PGR student), Mcellistrim, A. (PGR student), Meehan, M. (PGR student), Okwelogu, E. (PGR student), Taylor, M. (PGR student), Wang, W. (PGR student), Xin, B. (PGR student), Castle, C. (PGR student), Clout, P. (PGR student), Dean, S. D. (PGR student), Fordham, A. (PGR student), Griffin, E. (PGR student), Hardwick, T. (PGR student), Hawkins-Pottier, G. (PGR student), Jones, A. (PGR student), Lewthwaite, K. (PGR student), Monteil, S. (PGR student), Moulsdale, C. (PGR student), Mullan, C. (PGR student), Orts Mercadillo, V. (PGR student), Sanderson, D. (PGR student), Skliueva, I. (PGR student), Skuse, C. (PGR student), Steiner, P. (PGR student), Winstanley, B. (PGR student), Barry, D. (PGR student), Brooks, D. (PGR student), Cai, J. (PGR student), Chen, Y. (PGR student), Chen, C. (PGR student), Draude, A. (PGR student), Emmerson, C. (PGR student), Gavriliuc, V. (PGR student), Greaves, M. (PGR student), Higgins, E. (PGR student), Mcmaster, R. (PGR student), Mcnair, R. (PGR student), O'Brien, C. (PGR student), Peasey, A. (PGR student), Pinter, G. (PGR student), Shao, S. (PGR student), Thomas, D. (PGR student), Thomas, D. (PGR student), Tsim, L. T. B. (PGR student), Wengraf, J. (PGR student), Weston, A. (PGR student), Yu, T. (PGR student), De Libero, H. (PGR student), Chan, K. C. (PGR student), Tan, Y. T. (PGR student) & Thomson, T. (CoI)
1/04/14 → 31/10/25
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