1990/05/01 by G. Kalman, K. I. Golden · 5 citations
Physics and Astronomy · Materials Science · #Advanced Chemical Physics Studies #Physics of Superconductivity and Magnetism #Material Dynamics and Properties
paper · doi:10.1103/physreva.41.5516
openalex publication_date 1990/05/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present a new approach for the calculation of the dielectric response functions for various strongly coupled Coulomb systems, whose main common feature is that the charges are quasilocalized. Such a model is expected to be a valid description of a strongly coupled plasma in the \ensuremathΓ\ensuremath≫1 limit. The dielectric function \ensuremathε(k\ensuremathω) and the longitudinal plasmon dispersion \ensuremathω(k) appear as functionals of the equilibrium pair-correlation functions. We derive the longitudinal-plasmon dispersions for arbitrary k values for the three- and two-dimensional one-component plasmas; both of them saturate after an oscillatory behavior substantially below their random-phase approximation value for large k values. In two-component systems correlational effects bring about marked upward and downward shifts in the plasma frequency \ensuremathω(k=0). We find good agreement with molecular-dynamics data for H+-H2+ mixtures and predict a more significant shift for H+--high-Z mixtures.