We investigate the viability of the phaseless finite-temperature auxiliary-field quantum Monte Carlo (ph-FT-AFQMC) method for ab initio systems using the uniform electron gas as a model. Through comparisons with exact results and FT coupled cluster theory, we find that ph-FT-AFQMC is sufficiently accurate at high to intermediate electronic densities. We show, both analytically and numerically, that the phaseless constraint at FT is fundamentally different from its zero-temperature counterpart (i.e., ph-ZT-AFQMC), and generally, one should not expect ph-FT-AFQMC to agree with ph-ZT-AFQMC in the low-temperature limit. With an efficient implementation, we are able to compare exchange-correlation energies to the existing results in the thermodynamic limit and find that the existing parameterizations are highly accurate. In particular, we found that ph-FT-AFQMC exchange-correlation energies are in better agreement with a known parameterization than is restricted path-integral MC in the regime of Θ ≤ 0.5 and rs ≤ 2, which highlights the strength of ph-FT-AFQMC.
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14 February 2021
Research Article|
February 12 2021
A phaseless auxiliary-field quantum Monte Carlo perspective on the uniform electron gas at finite temperatures: Issues, observations, and benchmark study
Joonho Lee
;
Joonho Lee
a)
1
Department of Chemistry, Columbia University
, New York, New York 10027, USA
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Miguel A. Morales;
Miguel A. Morales
2
Quantum Simulations Group, Lawrence Livermore National Laboratory
, 7000 East Avenue, Livermore, California 94551, USA
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Fionn D. Malone
Fionn D. Malone
a)
2
Quantum Simulations Group, Lawrence Livermore National Laboratory
, 7000 East Avenue, Livermore, California 94551, USA
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J. Chem. Phys. 154, 064109 (2021)
Article history
Received:
December 22 2020
Accepted:
January 17 2021
Citation
Joonho Lee, Miguel A. Morales, Fionn D. Malone; A phaseless auxiliary-field quantum Monte Carlo perspective on the uniform electron gas at finite temperatures: Issues, observations, and benchmark study. J. Chem. Phys. 14 February 2021; 154 (6): 064109. https://doi.org/10.1063/5.0041378
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