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P: Fachverband Plasmaphysik

P 14: Codes and modelling

P 14.7: Vortrag

Mittwoch, 11. März 2020, 15:40–15:55, b302

Dynamic structure factor of Yukawa liquids: molecular dynamics simulations and memory function approach — •Hanno Kählert — ITAP, Christian-Albrechts-Universität zu Kiel

Molecular dynamics simulations are used to compute the dynamic structure factor (DSF) of a strongly coupled Yukawa liquid over a wide range of coupling strengths. Despite its simplicity, the Yukawa model is of relevance for a variety of systems, including dense plasmas or strongly coupled dusty plasmas. The results for the DSF are compared with a theoretical approach based on the memory function formalism. In particular, a memory function incorporating viscoelastic effects [1] is applied to model the collective behavior of the Yukawa liquid at long wavelengths and low frequencies. Fitting the model to the simulation data allows one to estimate transport coefficients such as the viscosity. In addition, the fluctuation-dissipation theorem and the Kramers-Kronig relations are used to compute the complex density response function, which makes it possible to obtain the memory function directly from the simulation data.

[1] U. Bafile, E. Guarini, and F. Barocchi, Phys. Rev. E 73, 061203 (2006).