Ion-Wake induced anomaly of Dust Lattice Mode in presence of external Magnetic field

Abstract

We report a theoretical investigation of DL mode (Dust Lattice) in 2D Yukawa crystal in presence of asymmetric ion flow and external magnetic field perpendicular to the crystal plane. Two mutually perpendicular modes are found to be coupled due to Lorentz force. Interaction among the dust grains along vertical direction is strongly affected due to the formation of ion-wake. This causes anisotropy in interaction strength along two mutually perpendicular directions. Both hybrid modes are studied as characteristics of different ion flow speed and magnetic field strength. The study shows a fluctuation in DL mode frequency driven by the strength of the particle-wake interaction. Effect of ion flow on polarization of the hybrid wave amplitudes is discussed in details. Results show a possible mechanism of anomalous phase transition in dusty plasma.