1College of Science, China Agricultural University, Beijing 100083 2School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025 3Key Laboratory of Agricultural Informationization Standardization (Beijing), Ministry of Agriculture, Beijing 100083 4Department of Physics, Beijing University of Chemical Technology, Beijing 100029
Abstract：Effect of the particle number density on the dispersion properties of longitudinal and transverse lattice waves in a two-dimensional Yukawa charged-dust system is investigated using molecular dynamics simulation. The dispersion relations for the waves are obtained. It is found that the frequencies of both the longitudinal and transverse dust waves increase with the density and when the density is sufficiently high a cutoff region appears at the short wavelength. With the increase of the particle number density, the common frequency tends to increase, and the sound speed of the longitudinal wave also increases, but that of the transverse wave remains low.
2017, Vol. 34 
