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Fast and accurate quantum Monte Carlo for molecular crystals

Zen, A; Brandenburg, JG; Klimeš, J; Tkatchenko, A; Alfè, D; Michaelides, A; (2018) Fast and accurate quantum Monte Carlo for molecular crystals. Proceedings of the National Academy of Sciences of the United States of America (PNAS) 10.1073/pnas.1715434115. (In press). Green open access

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Abstract

Computer simulation plays a central role in modern-day materials science. The utility of a given computational approach depends largely on the balance it provides between accuracy and computational cost. Molecular crystals are a class of materials of great technological importance which are challenging for even the most sophisticated ab initio electronic structure theories to accurately describe. This is partly because they are held together by a balance of weak intermolecular forces but also because the primitive cells of molecular crystals are often substantially larger than those of atomic solids. Here, we demonstrate that diffusion quantum Monte Carlo (DMC) delivers subchemical accuracy for a diverse set of molecular crystals at a surprisingly moderate computational cost. As such, we anticipate that DMC can play an important role in understanding and predicting the properties of a large number of molecular crystals, including those built from relatively large molecules which are far beyond reach of other high-accuracy methods.

Type: Article
Title: Fast and accurate quantum Monte Carlo for molecular crystals
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1073/pnas.1715434115
Publisher version: https://doi.org/10.1073/pnas.1715434115
Language: English
Additional information: This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND). For more info see: https://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Electronic structure, molecular crystal, quantum Monte Carlo
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10043536
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