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Thermodynamics and dynamics of two-dimensional systems with dipole-like repulsive interactions

Khrapak, Sergey and Kryuchkov, Nikita and Yurchenko, Stanislav (2018) Thermodynamics and dynamics of two-dimensional systems with dipole-like repulsive interactions. Physical Review E, 97 (2), 022616. American Physical Society. DOI: 10.1103/PhysRevE.97.022616 ISSN 1539-3755

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Abstract

Thermodynamics and dynamics of a classical two-dimensional system with dipolelike isotropic repulsive interactions are studied systematically using extensive molecular dynamics (MD) simulations supplemented by appropriate theoretical approximations. This interaction potential, which decays as an inverse cube of the interparticle distance, belongs to the class of very soft long-ranged interactions. As a result, the investigated system exhibits certain universal properties that are also shared by other related soft-interacting particle systems (like, for instance, the one-component plasma and weakly screened Coulomb systems). These universalities are explored in this article to construct a simple and reliable description of the system thermodynamics. In particular, Helmholtz free energies of the fluid and solid phases are derived, from which the location of the fluid-solid coexistence is determined. The quasicrystalline approximation is applied to the description of collective modes in dipole fluids. Its simplification, previously validated on strongly coupled plasma fluids, is used to derive explicit analytic dispersion relations for the longitudinal and transverse wave modes, which compare satisfactory with those obtained from direct MD simulations in the long-wavelength regime. Sound velocities of the dipole fluids and solids are derived and analyzed.

Item URL in elib:https://elib.dlr.de/119382/
Document Type:Article
Title:Thermodynamics and dynamics of two-dimensional systems with dipole-like repulsive interactions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Khrapak, SergeyDLR, Sergey.Khrapak (at) dlr.deUNSPECIFIED
Kryuchkov, NikitaBMSTU, Moscow, RussiaUNSPECIFIED
Yurchenko, StanislavBMSTU, Moscow, RussiaUNSPECIFIED
Date:28 February 2018
Journal or Publication Title:Physical Review E
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:97
DOI :10.1103/PhysRevE.97.022616
Page Range:022616
Publisher:American Physical Society
ISSN:1539-3755
Status:Published
Keywords:two-dimensional (2D) systems, soft interacting particles in two-dimensions, thermodynamics, phase transitions, collective modes
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 - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Komplexe Plasmen / Theory, Simulation
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space > Research Group Complex Plasma
Deposited By: Khrapak, Sergey
Deposited On:19 Mar 2018 08:00
Last Modified:31 Jul 2019 20:16

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