| DOI | Resolve DOI: https://doi.org/10.1103/PhysRevE.106.065208 |
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| Author | Search for: Dharma-wardana, M. W. C.1ORCID identifier: https://orcid.org/0000-0001-8987-9071; Search for: Stanek, Lucas J.ORCID identifier: https://orcid.org/0000-0001-9471-3324; Search for: Murillo, Michael S. |
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| Affiliation | - National Research Council of Canada. Security and Disruptive Technologies
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| Funder | Search for: Air Force Office of Scientific Research |
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| Format | Text, Article |
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| Abstract | Accurate equations of state (EOS) and plasma transport properties are essential for numerical simulations of warm dense matter encountered in many high-energy-density situations. Molecular dynamics (MD) is a simulation method that generates EOS and transport data using an externally provided potential to dynamically evolve the particles without further reference to the electrons. To minimize computational cost, pair potentials needed in MD may be obtained from the neutral-pseudoatom (NPA) approach, a form of single-ion density functional theory (DFT), where many-ion effects are included via ion-ion correlation functionals. Standard N-ion DFT-MD provides pair potentials via the force matching technique but at much greater computational cost. Here we propose a simple analytic model for pair potentials with physically meaningful parameters based on a Yukawa form with a thermally damped Friedel tail (YFT) applicable to systems containing free electrons. The YFT model accurately fits NPA pair potentials or the nonparametric force-matched potentials from N-ion DFT-MD, showing excellent agreement for a wide range of conditions. The YFT form provides accurate extrapolations of the NPA or force-matched potentials for small and large particle separations within a physical model. Our method can be adopted to treat plasma mixtures, allowing for large-scale simulations of multispecies warm dense matter. |
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| Publication date | 2022-12-22 |
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| Publisher | American Physical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 023ad24e-aa91-4e6f-baa6-14de9833d6a9 |
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| Record created | 2024-02-07 |
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| Record modified | 2024-02-07 |
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