Dynamical structure factor of complex plasmas for varying wave vectors

Abstract

The dynamical structure factor has been reported for three dimensional strongly coupled Yukawa liquids (SCYLs) through state-of-the-art equilibrium molecular dynamics (EMD) simulations in a microcanonical ensemble (NVE). The effects of varying wave vectors (k = 2π/L) have been computed along with different arrangements of Coulomb coupling (Γ) and the Debye screening parameter (κ) on the dynamical structure-factor S(k,ω) using EMD simulations. Our new investigations of S(k,ω) show that the amplitude of oscillation decreases and the frequency increases with increasing Γ, respectively, for the SCYLs. Our simulations show that the decreasing behavior is noted for the frequency of plasma S(k,ω) with increasing κ and system size (N). The obtained EMD results are found to be more efficient and accurate than that of various previous simulation data, and the present EMD approach gives more satisfactory results with appropriate system sizes at high values of k, for a wide range of plasma states (Γ, κ). It has been shown that the present density S(k,ω) of SCYLs fluctuates more at intermediate to high Coulomb couplings (average to lower system temperature ≡ 1/Γ) and low values of Debye screening; however, it less fluctuates at higher N and κ.