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Comparing ab initio and quantum-kinetic approaches to electron transport in warm dense matter

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/5.0197985· OSTI ID:2567744

Accurate knowledge of the electronic transport properties of warm dense matter is one of the main concerns of research in high-energy-density physics. Three modern approaches with vastly different levels of fidelity are reviewed and compared: the Kubo–Greenwood (KG) approach based on density-functional-theory molecular dynamics simulations (QMD), quantum kinetic theory based on average-atom models, and time-dependent density functional theory. Throughout, emphasis is placed on the connection between static properties of the electrons (e.g., density of states) and transport properties. Overall, it is found that whenever the conduction electrons can be modeled as being nearly free, fair to excellent agreement is found between QMD and kinetic theory approaches. Such a circumstance is required for modeling warm dense matter as a plasma of ions and free electrons, which is assumed in most kinetic theory approaches. The sensitivity of transport properties to the electronic structure is further highlighted by comparing different exchange–correlation approximations in QMD and KG calculations. It is found that the inclusion of exact exchange via thermal hybrid functionals can make a pronounced impact on electrical and thermal conduction in warm dense matter. We also investigate dynamic screening physics via kinetic theory and time-dependent density functional theory calculations of the mean free path of an electron in a hot dense plasma. In sum, we identify three axes along which to make progress in predicting electron transport in warm dense matter.

Research Organization:
University of Rochester, NY (United States)
Sponsoring Organization:
U.S. National Science Foundation; USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0004144
OSTI ID:
2567744
Alternate ID(s):
OSTI ID: 2372913
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 31; ISSN 1070-664X
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English

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