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Point defect formation energies in graphene from diffusion quantum Monte Carlo and density functional theory

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Point defect formation energies in graphene from diffusion quantum Monte Carlo and density functional theory. / Thomas, David; Asiri, Yassmin; Drummond, Neil.
In: Physical Review B: Condensed Matter and Materials Physics, Vol. 105, No. 18, 184114, 31.05.2022.

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Thomas D, Asiri Y, Drummond N. Point defect formation energies in graphene from diffusion quantum Monte Carlo and density functional theory. Physical Review B: Condensed Matter and Materials Physics. 2022 May 31;105(18):184114. doi: 10.1103/PhysRevB.105.184114

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@article{eade149b515f4776ba2fa29c68970ffe,
title = "Point defect formation energies in graphene from diffusion quantum Monte Carlo and density functional theory",
abstract = "Density functional theory (DFT) is widely used to study defects in monolayer graphene with a view to applications ranging from water filtration to electronics to investigations of radiation damage in graphite moderators. To assess the accuracy of DFT in such applications, we report diffusion quantum Monte Carlo (DMC) calculations of the formation energies of some common and important point defects in monolayer graphene: monovacancies, Stone-Wales defects, and silicon substitutions. We find that standard DFT methods underestimate monovacancy formation energies by around 1 eV. The disagreement between DFT and DMC is somewhat smaller for Stone-Wales defects and silicon substitutions. We examine vibrational contributions to the free energies of formation for these defects, finding that vibrational effects are non-negligible. Finally, we compare the DMC atomization energies of monolayer graphene, monolayer silicene, and bulk silicon, finding that bulk silicon is significantly more stable than monolayer silicene by 0.7522(5) eV per atom.",
author = "David Thomas and Yassmin Asiri and Neil Drummond",
note = "{\textcopyright} 2022 American Physical Society",
year = "2022",
month = may,
day = "31",
doi = "10.1103/PhysRevB.105.184114",
language = "English",
volume = "105",
journal = "Physical Review B: Condensed Matter and Materials Physics",
issn = "1098-0121",
publisher = "AMER PHYSICAL SOC",
number = "18",

}

RIS

TY - JOUR

T1 - Point defect formation energies in graphene from diffusion quantum Monte Carlo and density functional theory

AU - Thomas, David

AU - Asiri, Yassmin

AU - Drummond, Neil

N1 - © 2022 American Physical Society

PY - 2022/5/31

Y1 - 2022/5/31

N2 - Density functional theory (DFT) is widely used to study defects in monolayer graphene with a view to applications ranging from water filtration to electronics to investigations of radiation damage in graphite moderators. To assess the accuracy of DFT in such applications, we report diffusion quantum Monte Carlo (DMC) calculations of the formation energies of some common and important point defects in monolayer graphene: monovacancies, Stone-Wales defects, and silicon substitutions. We find that standard DFT methods underestimate monovacancy formation energies by around 1 eV. The disagreement between DFT and DMC is somewhat smaller for Stone-Wales defects and silicon substitutions. We examine vibrational contributions to the free energies of formation for these defects, finding that vibrational effects are non-negligible. Finally, we compare the DMC atomization energies of monolayer graphene, monolayer silicene, and bulk silicon, finding that bulk silicon is significantly more stable than monolayer silicene by 0.7522(5) eV per atom.

AB - Density functional theory (DFT) is widely used to study defects in monolayer graphene with a view to applications ranging from water filtration to electronics to investigations of radiation damage in graphite moderators. To assess the accuracy of DFT in such applications, we report diffusion quantum Monte Carlo (DMC) calculations of the formation energies of some common and important point defects in monolayer graphene: monovacancies, Stone-Wales defects, and silicon substitutions. We find that standard DFT methods underestimate monovacancy formation energies by around 1 eV. The disagreement between DFT and DMC is somewhat smaller for Stone-Wales defects and silicon substitutions. We examine vibrational contributions to the free energies of formation for these defects, finding that vibrational effects are non-negligible. Finally, we compare the DMC atomization energies of monolayer graphene, monolayer silicene, and bulk silicon, finding that bulk silicon is significantly more stable than monolayer silicene by 0.7522(5) eV per atom.

U2 - 10.1103/PhysRevB.105.184114

DO - 10.1103/PhysRevB.105.184114

M3 - Journal article

VL - 105

JO - Physical Review B: Condensed Matter and Materials Physics

JF - Physical Review B: Condensed Matter and Materials Physics

SN - 1098-0121

IS - 18

M1 - 184114

ER -