Dual-frequency modes of the dust acoustic surface wave in a semibounded system.
Dual-frequency modes of the dust acoustic surface waves propagating at the interface between a nonmagnetized multicomponent Lorentzian dusty plasma and a vacuum are investigated, including nonthermal and positron effects. The dispersion relation is kinetically derived by employing the specular reflection boundary condition and the dielectric permittivity for dusty plasma containing positrons. We found that there exist two modes of the dust acoustic surface wave; high- and low-frequency modes. We observe that both H and L modes are enhanced by the increase of the pair annihilation rate. However, the effects of positron density are twofold depending on the ratio of annihilated positrons. The effects of nonthermal plasmas are also investigated on the H and L modes of dust acoustic surface waves. We found that the nonthermal plasmas reduce the frequencies of both H and L modes.
Department of Physics and Research Institute for Natural Sciences, Hanyang University, Seoul 04763, South Korea.
Myoung-Jae
MJ
Lee
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180-3590, USA and Department of Applied Physics and Department of Bionanotechnology, Hanyang University, Ansan, Kyunggi-Do 15588, South Korea.
Young-Dae
YD
Jung
D004391:Dust; D004583:Electrons; D007477:Ions; D008962:Models, Theoretical; D013016:Sound; D014618:Vacuum
D004391:Dust; D007477:Ions