Collective modes of two-dimensional classical Coulomb fluids
Abstract
Molecular dynamics simulations have been performed to investigate in detail collective modes spectra of two-dimensional Coulomb fluids in a wide range of coupling. The obtained dispersion relations are compared with theoretical approaches based on quasi-crystalline approximation (QCA), also known as the quasi-localized charge approximation (QLCA) in the plasma-related context. An overall satisfactory agreement between theory and simulations is documented for the longitudinal mode at moderate coupling and in the long-wavelength domain at strong coupling. For the transverse mode, satisfactory agreement in the long-wavelength domain is only reached at very strong coupling, when the cutoff wave-number below which shear waves cannot propagate becomes small. The dependence of the cutoff wave-number for shear waves on the coupling parameter is obtained.
Cite
@article{arxiv.1810.04435,
title = {Collective modes of two-dimensional classical Coulomb fluids},
author = {S. A. Khrapak and N. P. Kryuchkov and L. A. Mistryukova and A. G. Khrapak and S. O. Yurchenko},
journal= {arXiv preprint arXiv:1810.04435},
year = {2018}
}
Comments
10 pages, 6 figures