Relevance of the Wigner–Seitz Cell Approximation for the Coulomb Clusters

E. S. Shpil’ko; Шпилько Е. С.; D. I. Zhukhovitskii; Жуховицкий Д. И.

doi:10.31857/S0367292123600590

Relevance of the Wigner–Seitz Cell Approximation for the Coulomb Clusters

Authors: Shpil’ko E.S.¹^,2, Zhukhovitskii D.I.¹^,2
Affiliations:
1. Joint Institute for High Temperatures, Russian Academy of Sciences
2. Moscow Institute of Physics and Technology (National Research University)
Issue: Vol 49, No 10 (2023)
Pages: 1003-1009
Section: ПЫЛЕВАЯ ПЛАЗМА
URL: https://journals.rcsi.science/0367-2921/article/view/232795
DOI: https://doi.org/10.31857/S0367292123600590
EDN: https://elibrary.ru/EQDRKD
ID: 232795

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Abstract
About the authors
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Abstract

A molecular dynamics simulation of a system of massive charged particles on a compensating homogeneous background confined by a spherical surface has been carried out. A crystallized cluster is a set of nested spherical shells of almost the same structure and a core. It is shown that cluster melting is a combination of shell and core melting. It is found that the values of the Coulomb coupling parameter Γ corresponding to these two types of melting do not depend on the cluster size. Methods for determining Γ based on the Wigner–Seitz cell model are discussed. It is shown that the estimate based on the root-mean-square deviation of a particle from the center of its cell is unreliable due to the self-diffusion of particles. A relation is proposed that defines Γ in terms of the root-mean-square velocity and acceleration of the particle and does not include the root-mean-square deviation of the particle from its average position. It is shown that this relation is satisfied with high accuracy not only for the crystallized, but also for the liquid state. Thus, it has been demonstrated that the Wigner–Seitz cell model is applicable to the strongly inhomogeneous system under consideration.

Keywords

complex plasma, one-component plasma, strongly coupled plasma, Coulomb cluster, melting

About the authors

E. S. Shpil’ko

Joint Institute for High Temperatures, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Email: dmr@ihed.ras.ru
125412, Moscow, Russia; 141701, Dolgoprudny, Moscow oblast, Russia

D. I. Zhukhovitskii

Joint Institute for High Temperatures, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Author for correspondence.
Email: dmr@ihed.ras.ru
125412, Moscow, Russia; 141701, Dolgoprudny, Moscow oblast, Russia

References

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