Waves in two-dimensional superparamagnetic dusty plasma liquids.
Wave dispersion relations in the strongly coupled liquid phase of a two-dimensional system of dust grains interacting via both Yukawa and dipole interactions are investigated. The model system comprises a layer of charged superparamagnetic grains in a plasma in an external, uniform magnetic field B whose magnitude and direction can be varied. Because the induced magnetic dipole moments of the grains lie along B, the interaction between the grains becomes anisotropic as B is tilted with respect to the layer. The theoretical approach uses a reformulated quasilocalized charge approximation that can treat dipole interactions, combined with molecular dynamics simulations. The mode dispersion relations are found to depend on the relative strengths of the Yukawa and dipole interactions and the direction of wave propagation in the plane.
Institute for Solid State Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary and Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
Peter
P
Hartmann
Institute for Solid State Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 49, Hungary and Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
Zoltán
Z
Donkó
Department of Electrical and Computer Engineering, University of California San Diego, La Jolla California 92093, USA.
Marlene
M
Rosenberg
Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
Gabor J
GJ
Kalman