Fluorographene (FG) is a promising graphene-derived material with a large bandgap. Currently existing predictions of its fundamental gap (Δf) and optical gap (Δopt) significantly vary when compared with experiment. We provide here an ultimate benchmark of Δf for FG by many-body GW and fixed-node diffusion Monte Carlo (FNDMC) methods. Both approaches independently arrive at Δf ≈ 7.1 ± 0.1 eV. In addition, the Bethe–Salpeter equation enabled us to determine the first exciton binding energy, Eb = 1.92 eV. We also point to the possible misinterpretation problem of the results obtained for gaps of solids by FNDMC with single-reference trial wave functions of Bloch orbitals. We argue why instead of Δopt, in the thermodynamic limit, such an approach results in energy differences that rather correspond to Δf, and we also outline conditions when this case actually applies.
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14 November 2020
Research Article|
November 11 2020
Fundamental gap of fluorographene by many-body GW and fixed-node diffusion Monte Carlo methods
Special Collection:
Frontiers of Stochastic Electronic Structure Calculations
Matúš Dubecký
;
Matúš Dubecký
a)
1
Department of Physics, Faculty of Science, University of Ostrava
, 30. dubna 22, 701 03 Ostrava, Czech Republic
2
ATRI, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava
, J. Bottu 25, 917 24 Trnava, Slovakia
a)Author to whom correspondence should be addressed: [email protected]
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František Karlický
;
František Karlický
b)
1
Department of Physics, Faculty of Science, University of Ostrava
, 30. dubna 22, 701 03 Ostrava, Czech Republic
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Stanislav Minárik
;
Stanislav Minárik
2
ATRI, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava
, J. Bottu 25, 917 24 Trnava, Slovakia
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Lubos Mitas
Lubos Mitas
3
Department of Physics and CHiPS, North Carolina State University
, Raleigh, North Carolina 27695, USA
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the JCP Special Topic on Frontiers of Stochastic Electronic Structure Calculations.
J. Chem. Phys. 153, 184706 (2020)
Article history
Received:
September 25 2020
Accepted:
October 22 2020
Citation
Matúš Dubecký, František Karlický, Stanislav Minárik, Lubos Mitas; Fundamental gap of fluorographene by many-body GW and fixed-node diffusion Monte Carlo methods. J. Chem. Phys. 14 November 2020; 153 (18): 184706. https://doi.org/10.1063/5.0030952
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