We report a numerical study of the equation of state of crystalline body-centered-cubic (BCC) hydrogen, tackled with a variety of complementary many-body wave function methods. These include continuum stochastic techniques of fixed-node diffusion and variational quantum Monte Carlo and the Hilbert space stochastic method of full configuration-interaction quantum Monte Carlo. In addition, periodic coupled-cluster methods were also employed. Each of these methods is underpinned with different strengths and approximations, but their combination in order to perform reliable extrapolation to complete basis set and supercell size limits gives confidence in the final results. The methods were found to be in good agreement for equilibrium cell volumes for the system in the BCC phase.
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28 November 2020
Research Article|
November 24 2020
Equation of state of atomic solid hydrogen by stochastic many-body wave function methods
Special Collection:
Frontiers of Stochastic Electronic Structure Calculations
Sam Azadi
;
Sam Azadi
a)
1
Department of Physics, King’s College London
, Strand, WC2R 2LS London, United Kingdom
a)Author to whom correspondence should be addressed: sam.azadi@kcl.ac.uk
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George H. Booth
;
George H. Booth
1
Department of Physics, King’s College London
, Strand, WC2R 2LS London, United Kingdom
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Thomas D. Kühne
Thomas D. Kühne
2
Department of Chemistry, Paderborn Center for Parallel Computing, Paderborn University
, 33098 Paderborn, Germany
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a)Author to whom correspondence should be addressed: sam.azadi@kcl.ac.uk
Note: This paper is part of the JCP Special Topic on Frontiers of Stochastic Electronic Structure Calculations.
J. Chem. Phys. 153, 204107 (2020)
Article history
Received:
August 24 2020
Accepted:
November 06 2020
Citation
Sam Azadi, George H. Booth, Thomas D. Kühne; Equation of state of atomic solid hydrogen by stochastic many-body wave function methods. J. Chem. Phys. 28 November 2020; 153 (20): 204107. https://doi.org/10.1063/5.0026499
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