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Instantaneous shear modulus of Yukawa fluids across coupling regimes

Khrapak, Sergey and Klumov, Boris (2020) Instantaneous shear modulus of Yukawa fluids across coupling regimes. Physics of Plasmas, 27, 024501. American Institute of Physics (AIP). doi: 10.1063/1.5140858. ISSN 1070-664X.

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Abstract

The high frequency (instantaneous) shear modulus of three-dimensional Yukawa systems is evaluated in a wide parameter range from the very weakly coupled gaseous state to the strongly coupled fluid at the crystallization point (Yukwa melt). This allows us to quantify how shear rigidity develops with increasing coupling and inter-particle correlations. The radial distribution functions (RDFs) needed to calculate the excess shear modulus have been obtained from extensive molecular dynamics (MD) simulations. MD results demonstrate that fluid RDFs appear quasi-universal on the curves parallel to the melting line of a Yukawa solid in accordance with the isomorph theory of Roskildesimple systems. This quasi-universality allows us to simplify considerably calculations of quantities involving integrals of the RDF (elastic moduli represent just one relevant example). The calculated reduced shear modulus grows linearly with the coupling parameter at weak coupling and approaches a quasi-constant asymptote at strong coupling. The asymptotic value at strong coupling is in reasonably good agreement with the existing theoretical approximation.

Item URL in elib:https://elib.dlr.de/134027/
Document Type:Article
Additional Information:Paper selected as Editors' Pick
Title:Instantaneous shear modulus of Yukawa fluids across coupling regimes
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Khrapak, SergeyUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klumov, BorisJoint Institute for High TemperaturesUNSPECIFIEDUNSPECIFIED
Date:4 February 2020
Journal or Publication Title:Physics of Plasmas
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:27
DOI:10.1063/1.5140858
Page Range:024501
Publisher:American Institute of Physics (AIP)
ISSN:1070-664X
Status:Published
Keywords:complex (dusty) plasmas, Yukawa systems, Yukawa fluids, elastic moduli, structural properties, strongly coupled systems
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Komplexe Plasmen / Theory, Simulation (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Khrapak, Sergey
Deposited On:10 Feb 2020 07:21
Last Modified:24 Oct 2023 11:13

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