RESPONSE FUNCTION AND PLASMON DISPERSION FOR STRONGLY COUPLED COULOMB LIQUIDS

被引:149
作者
KALMAN, G [1 ]
GOLDEN, KI [1 ]
机构
[1] UNIV VERMONT, DEPT COMP SCI & ELECT ENGN, BURLINGTON, VT 05405 USA
来源
PHYSICAL REVIEW A | 1990年 / 41卷 / 10期
关键词
D O I
10.1103/PhysRevA.41.5516
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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 1 limit. The dielectric function (k) and the longitudinal plasmon dispersion (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 (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. © 1990 The American Physical Society.
引用
收藏
页码:5516 / 5527
页数:12
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