Imperial College London
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ProfessorJohannesLischner

Faculty of Engineering, Department of Materials

Professor of Theory and Simulation of Materials
 
 
 
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Contact

 

+44 (0)20 7594 9949j.lischner

 
 
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Location

 

342Bessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Goodwin:2020:2516-1075/ab9f94,
author = {Goodwin, Z and Vitale, V and Liang, X and Mostofi, AA and Lischner, J},
doi = {2516-1075/ab9f94},
journal = {Physical Review B: Condensed Matter and Materials Physics},
title = {Hartree theory calculations of quasiparticle properties in twisted bilayer graphene},
url = {http://dx.doi.org/10.1088/2516-1075/ab9f94},
volume = {2},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A detailed understanding of interacting electrons in twisted bilayer graphene(tBLG) near the magic angle is required to gain insights into the physicalorigin of the observed broken symmetry phases including correlated insulatorstates and superconductivity. Here, we present extensive atomistic Hartreetheory calculations of the electronic properties of tBLG in the (semi-)metallicphase as function of doping and twist angle. Specifically, we calculatequasiparticle properties, such as the band structure, density of states (DOS)and local density of states (LDOS), which are directly accessible inphotoemission and tunnelling spectroscopy experiments. We find thatquasiparticle properties change significantly upon doping - an effect which isnot captured by tight-binding theory. In particular, we observe that thepartially occupied bands flatten significantly which enhances the density ofstates at the Fermi level and explains the experimentally observed Fermi levelpinning. We predict a clear signature of this band flattening in the LDOS inthe AB/BA regions of tBLG which can be tested in scanning tunnelingexperiments. We also study the dependence of quasiparticle properties on thedielectric environment of tBLG and discover that these properties aresurprisingly robust as a consequence of the strong internal screening. Finally,we present a simple analytical expression for the Hartree potential whichenables the determination of quasiparticle properties without the need forself-consistent calculations.
AU  - Goodwin,Z
AU  - Vitale,V
AU  - Liang,X
AU  - Mostofi,AA
AU  - Lischner,J
DO  - 2516-1075/ab9f94
PY  - 2020///
SN  - 1098-0121
TI  - Hartree theory calculations of quasiparticle properties in twisted bilayer graphene
T2  - Physical Review B: Condensed Matter and Materials Physics
UR  - http://dx.doi.org/10.1088/2516-1075/ab9f94
UR  - http://arxiv.org/abs/2004.14784v2
UR  - http://hdl.handle.net/10044/1/81144
VL  - 2
ER  -
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