Shear viscosity of two-dimensional strongly coupled complex (dusty) plasmas

Abstract

A molecular dynamics method has been employed of studying shear viscosity for two-dimensional plasma liquids. For the entire range of strongly coupled liquid states, shear autocorrelation functions indicate overall valid viscosity coefficients. A systematic dependence of shear viscosity value on screening strength (κ) is observed for an intermediate and higher Coulomb coupling strengths (Γ). The simulation data indicate that the position of the viscosity value shifts towards higher Γ as κ increases. It is observed that valid viscosity coefficient exists and it is dependent on plasma parameters (Γ, κ). A finite minimum viscosity exists nearly at the same value of T where the most extreme super-diffusion was earlier found and is reported for a wide range of coupling and screening parameters.