Imperial College London
Alternate

ProfessorArashMostofi

Faculty of Engineering, Department of Materials

Professor of Theory and Simulation of Materials
 
 
 
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Contact

 

+44 (0)20 7594 8154a.mostofi Website

 
 
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Location

 

Bessemer B332Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Goodwin:2019:10.1103/physrevb.100.121106,
author = {Goodwin, ZAH and Corsetti, F and Mostofi, AA and Lischner, J},
doi = {10.1103/physrevb.100.121106},
journal = {Physical Review B},
title = {Twist-angle sensitivity of electron correlations in moiré graphene bilayers},
url = {http://dx.doi.org/10.1103/physrevb.100.121106},
volume = {100},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Motivated by the recent observation of correlated insulator states and unconventional superconductivity in twisted bilayer graphene, we study the dependence of electron correlations on the twist angle and reveal the existence of strong correlations over a narrow range of twist angles near the magic angle. Specifically, we determine the on-site and extended Hubbard parameters of the low-energy Wannier states using an atomistic quantum-mechanical approach. The ratio of the on-site Hubbard parameter and the width of the flat bands, which is an indicator of the strength of electron correlations, depends sensitively on the screening by the semiconducting substrate and the metallic gates. Including the effect of long-ranged Coulomb interactions significantly reduces electron correlations and explains the experimentally observed sensitivity of strong-correlation phenomena on twist angles.
AU  - Goodwin,ZAH
AU  - Corsetti,F
AU  - Mostofi,AA
AU  - Lischner,J
DO  - 10.1103/physrevb.100.121106
PY  - 2019///
SN  - 2469-9950
TI  - Twist-angle sensitivity of electron correlations in moiré graphene bilayers
T2  - Physical Review B
UR  - http://dx.doi.org/10.1103/physrevb.100.121106
UR  - http://hdl.handle.net/10044/1/73638
VL  - 100
ER  -
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