A unified concept of effective one component plasma for hot dense plasmas

Abstract

Orbital-free molecular dynamics simulations are used to benchmark two popular models for hot dense plasmas: the one component plasma (OCP) and the Yukawa model. A unified concept emerges where an effective OCP (eOCP) is constructed from the short-range structure of the plasma. An unambiguous ionization and the screening length can be defined and used for a Yukawa system, which reproduces the long range structure with finite compressibility. Similarly, the dispersion relation of longitudinal waves is consistent with the screened model at vanishing wavenumber but merges with the OCP at high wavenumber. Additionally, the eOCP reproduces the overall relaxation timescales of the correlation functions associated with ionic motion. In the hot dense regime, this unified concept of eOCP can be fruitfully applied to deduce properties such as the equation of state, ionic transport coefficients, and the ion feature in x-ray Thomson scattering experiments.

5 pages, 4 Figures and Supplemental with 1 Figure Accepted for publication in PRL, Physical Review Letters 2016

References in corpus (2)

• Coupling Strength in Coulomb and Yukawa One-Component Plasmas
• Electron-ion scattering in dense multi-component plasmas: application to the outer crust of an accreting neutron star

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