Structural characteristics of strongly coupled ions in a dense quantum plasma

Zh. A. Moldabekov, S. Groth, T. Dornheim, H. Kählert, M. Bonitz, and T. S. Ramazanov
Phys. Rev. E 98, 023207 – Published 27 August 2018

Abstract

The structural properties of strongly coupled ions in dense plasmas with moderately to strongly degenerate electrons are investigated in the framework of the one-component plasma model of ions interacting through a screened pair interaction potential. Special focus is put on the description of the electronic screening in the Singwi-Tosi-Land-Sjölander (STLS) approximation. Different cross-checks and analyses using ion potentials obtained from ground-state quantum Monte Carlo data, the random phase approximation (RPA), and existing analytical models are presented for the computation of the structural properties, such as the pair distribution and the static structure factor, of strongly coupled ions. The results are highly sensitive to the features of the screened pair interaction potential. This effect is particularly visible in the static structure factor. The applicability range of the screened potential computed from STLS is identified in terms of density and temperature of the electrons. It is demonstrated that at rs>1, where rs is the ratio of the mean interelectronic distance to the Bohr radius, electronic correlations beyond RPA have a nonnegligible effect on the structural properties. Additionally, the applicability of the hypernetted chain approximation for the calculation of the structural properties using the screened pair interaction potential is analyzed employing the effective coupling parameter approach.

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  • Received 1 May 2018

DOI:https://doi.org/10.1103/PhysRevE.98.023207

©2018 American Physical Society

Physics Subject Headings (PhySH)

Plasma Physics

Authors & Affiliations

Zh. A. Moldabekov1,2, S. Groth1, T. Dornheim1, H. Kählert1, M. Bonitz1, and T. S. Ramazanov2

  • 1Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstraße 15, 24098 Kiel, Germany
  • 2Institute for Experimental and Theoretical Physics, Al-Farabi Kazakh National University, 71 Al-Farabi str., 050040 Almaty, Kazakhstan

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Issue

Vol. 98, Iss. 2 — August 2018

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