Pressure dependence of the magic twist angle in graphene superlattices
Name
PhysRevB.98.085144.pdf
Size
1.44 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Carr, Stephen
Fang, Shiang
Jarillo-Herrero, Pablo
Kaxiras, Efthimios
Date Issued
August 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Carr, Stephen et al. "Pressure dependence of the magic twist angle in graphene superlattices." Physical Review B 98, 8 (August 2018): 085144 © 2018 American Physical Society
Version
Final published version
Abstract
The recently demonstrated unconventional superconductivity [Cao et al., Nature (London) 556, 43 (2018)10.1038/nature26160] in twisted bilayer graphene (tBLG) opens the possibility for interesting applications of two-dimensional layers that involve correlated electron states. Here we explore the possibility of modifying electronic correlations by the application of uniaxial pressure on the weakly interacting layers, which results in increased interlayer coupling and a modification of the magic angle value and associated density of states. Our findings are based on first-principles calculations that accurately describe the height-dependent interlayer coupling through the combined use of density functional theory and maximally localized Wannier functions. We obtain the relationship between twist angle and external pressure for the magic angle flat bands of tBLG. This may provide a convenient method to tune electron correlations by controlling the length scale of the superlattice.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.98.085144
