Dispersion relations of Yukawa fluids at weak and moderate coupling

Sergey Khrapak and Lénaïc Couëdel

Phys. Rev. E 102, 033207 – Published 21 September 2020

Abstract

In this paper we compare different theoretical approaches to describe the dispersion of collective modes in Yukawa fluids when the interparticle coupling is relatively weak, so that the kinetic and potential contributions to the dispersion relation compete with each other. A thorough comparison with the results from molecular dynamics simulation allows us to conclude that, in the investigated regime, the best description is provided by the sum of the generalized excess bulk modulus and the Bohm-Gross kinetic term.

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Received 26 April 2020
Revised 18 August 2020
Accepted 19 August 2020

DOI:https://doi.org/10.1103/PhysRevE.102.033207

Physics Subject Headings (PhySH)

Elasticity Electrostatic waves & oscillations Mechanical & acoustical properties Plasma waves

Condensed Matter, Materials & Applied PhysicsPlasma Physics

Authors & Affiliations

Sergey Khrapak ^1,2,3 and Lénaïc Couëdel^4,5

¹Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 82234 Weßling, Germany
²Joint Institute for High Temperatures, Russian Academy of Sciences, 125412 Moscow, Russia
³Bauman Moscow State Technical University, 105005 Moscow, Russia
⁴Physics and Engineering Physics Department, University of Saskatchewan, 116 Science Place, S7N 5E2 Saskatoon, Saskatchewan, Canada
⁵CNRS, Aix-Marseille Université, Laboratoire PIIM, UMR 7345, 13397 Marseille cedex 20, France

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Issue

Vol. 102, Iss. 3 — September 2020

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Physical Review E

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