A full account of compressional wave in 2D strongly coupled complex (dusty) plasmas: Theory, experiment and numerical simulation
Department of Applied Mathematics, University of Waterloo - Waterloo, Ontario, Canada N2L 3G1
2 Max-Planck-Institute for extraterrestrial Physics - Giessenbachstraße, 85748 Garching, Germany, EU
Accepted: 10 May 2011
We present a first comprehensive theoretical, experimental and numerical study of compressional wave in a two-dimensional strongly coupled complex plasma in terms of the fluctuation spectra. Full spectra for different coupling strengths are calculated by means of generalized hydrodynamics within the memory function formalism by enforcing the low-order, high-frequency sum rules that employ the static structure factor and the radial distribution function from simulation as inputs. Results are compared with those from a laboratory experiment and a self-consistent Brownian dynamics simulation. Good agreement is found between theory and experiment, not only in the peak locations of spectra, i.e., the dispersion relations, but also in the half-widths of spectra, which represent the damping of the collective modes in liquid state for a broad range of wavelengths.
PACS: 52.27.Lw – Dusty or complex plasmas; plasma crystals / 52.27.Gr – Strongly-coupled plasmas / 66.10.cg – Mass diffusion, including self-diffusion, mutual diffusion, tracer diffusion, etc.
© EPLA, 2011