title: Linear and quadratic static response functions and structure functions in Yukawa liquids.
abstract: We compute linear and quadratic static density response functions of three-dimensional Yukawa liquids by applying an external perturbation potential in molecular dynamics simulations. The response functions are also obtained from the equilibrium fluctuations (static structure factors) in the system via the fluctuation-dissipation theorems. The good agreement of the quadratic response functions, obtained in the two different ways, confirms the quadratic fluctuation-dissipation theorem. We also find that the three-point structure function may be factorizable into two-point structure functions, leading to a cluster representation of the equilibrium triplet correlation function.
authors.affiliation: Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly-Thege Miklós Street 29-33, Hungary.
authors.forename: Péter
authors.initials: P
authors.lastname: Magyar
authors.affiliation: Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly-Thege Miklós Street 29-33, Hungary and Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Donkó
authors.affiliation: Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
authors.forename: Gabor J
authors.initials: GJ
authors.lastname: Kalman
authors.affiliation: Department of Mathematics and Statistics, and Department of Physics, University of Vermont, Burlington, Vermont USA.
authors.forename: Kenneth I
authors.initials: KI
authors.lastname: Golden
mesh_terms: D016014:Linear Models; D056004:Molecular Dynamics Simulation; D017711:Nonlinear Dynamics