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Isomorph invariance and thermodynamics of repulsive dense bi-Yukawa one-component plasmas
KTH, School of Electrical Engineering and Computer Science (EECS), Space and Plasma Physics.ORCID iD: 0000-0002-7310-3508
KTH, School of Electrical Engineering and Computer Science (EECS), Space and Plasma Physics.ORCID iD: 0000-0001-9632-8104
2019 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 26, no 5, article id 053705Article in journal (Refereed) Published
Abstract [en]

In numerous realizations of complex plasmas, dust-dust interactions are characterized by two screening lengths and are thus better described by a combination of Yukawa potentials. The present work investigates the static correlations and the thermodynamics of repulsive dense bi-Yukawa fluids based on the fact that such strongly coupled systems exhibit isomorph invariance. The strong virial-potential energy correlations are demonstrated with the aid of molecular dynamics simulations, an accurate analytical expression for the isomorph family of curves is obtained, and an empirical expression for the fluid-solid phase-coexistence line is proposed. The isomorph-based empirically modified hypernetted-chain approach, grounded on the ansatz of isomorph invariant bridge functions, is then extended to such systems and the resulting structural properties show an excellent agreement with the results of computer simulations. A simple and accurate closed-form expression is obtained for the excess internal energy of dense bi-Yukawa fluids by capitalizing on the compact parameterization offered by the Rosenfeld-Tarazona decomposition in combination with the Rosenfeld scaling, which opens up the energy route to thermodynamics.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019. Vol. 26, no 5, article id 053705
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-254174DOI: 10.1063/1.5100150ISI: 000470877600073Scopus ID: 2-s2.0-85066085294OAI: oai:DiVA.org:kth-254174DiVA, id: diva2:1328112
Note

QC 20190620

Available from: 2019-06-20 Created: 2019-06-20 Last updated: 2019-07-29Bibliographically approved

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Tolias, Panagiotis

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