Dynamic structure factor of strongly coupled Yukawa plasmas with dissipation

The dynamic structure factor (DSF) contains a wealth of information on the collective properties of strongly coupled plasmas. In the context of warm dense matter, it has been shown that dissipative processes can lead to the emergence of a strong peak in the ionic DSF around zero frequency [1]. In complex plasmas, dissipation caused by friction with the neutral gas has been found to affect the current fluctuation spectra in a two-dimensional layer of dust particles [2]. Here, the DSF of a 3D Yukawa one-component plasma is investigated in detail using Langevin dynamics simulations. Simulations are performed for a wide range of parameters, covering weakly and strongly damped systems. The numerical results are compared with a generalized hydrodynamics model that accounts for the dissipation mechanism [2,3].
[1] P. Mabey et al., Nat. Commun. 8, 14125 (2017).
[2] N. Upadhyaya et al., New J. Phys. 12, 093034 (2010).
[3] W. Hess and R. Klein, Adv. Phys. 32, 173 (1983).