Diffusion coefficients of electrorheological complex (dusty) plasmas

Equilibrium molecular dynamics (EMD) simulations have been executed to investigate the parallel (D_║) and perpendicular (D_┴) diffusion coefficients for three-dimensional (3D) strongly coupled (SC) electrorheological complex (dusty) plasmas (ERCPs). The effects of uniaxial (z-axis) AC electric field (M_T) on dust grains have been investigated along with various combinations of plasma parameters (Γ, κ). The new outcomes obtained by mean squared displacement of Einstein relation show diffusion coefficients for low-intermediate to high plasma couplings (Γ) for varying M_T. The D_║ and D_┴ at M_T = 0.01 agree well with earlier available data obtained from the Green-Kubo and Einstein relation for 3D SC-Yukawa systems. The simulation data show that D_║ increased with an increase in moderate M_T strength and that D_┴ decreased for the intermediate to large M_T strength. Both (D_║ and D_┴) remained nearly constant for low M_T values. The investigations show that the current EMD scheme is more efficient for nonideal gas-like, liquid-like, and solid-like states of SC-ERCPs. It has been demonstrated that present simulation outcomes extended the M_T range up to 0.01 ≤ M_T ≤ 10 to understand the diffusive and rheological behaviors of dusty plasma systems.