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Title: Collective excitations of a spherically confined Yukawa plasma

Abstract

The complete spectrum of eigenmodes of a spherically confined Yukawa plasma is presented, based on first-principle molecular dynamics simulations. These results are compared with a recent fluid theory for the multipole modes of this system [H. Kaehlert and M. Bonitz, Phys. Rev. E 82, 036407 (2010)] and with the exact N-particle eigenmodes in the crystalline phase. Simulations confirm the existence of high-order modes found in cold fluid theory. We investigate the influence of screening, coupling, and friction on the mode spectra in detail. Good agreement between theory and simulation is found for weak to moderate screening and low-order modes. In addition, a number of new modes are observed which are missing in the fluid theory. The relations between the breathing mode in the fluid theory, simulation, and the crystal eigenmode are investigated in further detail.

Authors:
;  [1]
  1. Institut fuer Theoretische Physik und Astrophysik, Christian-Albrechts Universitaet zu Kiel, D-24098 Kiel (Germany)
Publication Date:
OSTI Identifier:
21560289
Resource Type:
Journal Article
Journal Name:
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)
Additional Journal Information:
Journal Volume: 83; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevE.83.056401; (c) 2011 American Institute of Physics; Journal ID: ISSN 1539-3755
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; COLLECTIVE EXCITATIONS; COUPLING; CRYSTALS; EIGENFREQUENCY; FRICTION; MOLECULAR DYNAMICS METHOD; PLASMA; SCREENING; SIMULATION; SPECTRA; YUKAWA POTENTIAL; CALCULATION METHODS; ENERGY-LEVEL TRANSITIONS; EXCITATION; NUCLEAR POTENTIAL; POTENTIALS

Citation Formats

Kaehlert, H, and Bonitz, M. Collective excitations of a spherically confined Yukawa plasma. United States: N. p., 2011. Web. doi:10.1103/PHYSREVE.83.056401.
Kaehlert, H, & Bonitz, M. Collective excitations of a spherically confined Yukawa plasma. United States. https://doi.org/10.1103/PHYSREVE.83.056401
Kaehlert, H, and Bonitz, M. 2011. "Collective excitations of a spherically confined Yukawa plasma". United States. https://doi.org/10.1103/PHYSREVE.83.056401.
@article{osti_21560289,
title = {Collective excitations of a spherically confined Yukawa plasma},
author = {Kaehlert, H and Bonitz, M},
abstractNote = {The complete spectrum of eigenmodes of a spherically confined Yukawa plasma is presented, based on first-principle molecular dynamics simulations. These results are compared with a recent fluid theory for the multipole modes of this system [H. Kaehlert and M. Bonitz, Phys. Rev. E 82, 036407 (2010)] and with the exact N-particle eigenmodes in the crystalline phase. Simulations confirm the existence of high-order modes found in cold fluid theory. We investigate the influence of screening, coupling, and friction on the mode spectra in detail. Good agreement between theory and simulation is found for weak to moderate screening and low-order modes. In addition, a number of new modes are observed which are missing in the fluid theory. The relations between the breathing mode in the fluid theory, simulation, and the crystal eigenmode are investigated in further detail.},
doi = {10.1103/PHYSREVE.83.056401},
url = {https://www.osti.gov/biblio/21560289}, journal = {Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)},
issn = {1539-3755},
number = 5,
volume = 83,
place = {United States},
year = {Sun May 15 00:00:00 EDT 2011},
month = {Sun May 15 00:00:00 EDT 2011}
}