2016/05/01 by S. A. Khrapak, Sergey A. Khrapak, B. A. Klumov +3 · 16 citations
Chemistry · Materials Science · Physics and Astronomy · #Coupling (piping) #Dispersion (optics) #Dispersion relation #Domain (mathematical analysis) #Dust and Plasma Wave Phenomena #Electrostatics and Colloid Interactions #Function (biology) #Logarithm #Material Dynamics and Properties #Simple (philosophy) #cond-mat.soft #physics.plasm-ph
paper · pdf · doi:10.1063/1.4950829
published in Physics of Plasmas 23(5) (American Institute of Physics)
openalex publication_date 2016/05/01 · arxiv created 2016/06/06 · arxiv updated 2016/06/07 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
The collective modes of a familiar two-dimensional one-component-plasma with the repulsive logarithmic interaction between the particles are analysed using the quasi-crystalline approximation (QCA) combined with the molecular dynamic simulation of the equilibrium structural properties. It is found that the dispersion curves in the strongly coupled regime are virtually independent of the coupling strength. Arguments based on the excluded volume consideration for the radial distribution function allow us to derive very simple expressions for the dispersion relations, which show excellent agreement with the exact QCA dispersion over the entire domain of wavelengths. Comparison with the results of the conventional fluid analysis is performed, and the difference is explained.