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

TL;DR

This paper presents a theoretical study of dust lattice modes in a 2D Yukawa crystal under magnetic fields and ion flow, revealing mode coupling, anisotropic interactions, and potential phase transition mechanisms.

Contribution

It introduces a novel theoretical model analyzing coupled hybrid modes in dusty plasma influenced by ion wake effects and magnetic fields.

Findings

Mode coupling due to Lorentz force is identified.

Anisotropy in dust grain interactions caused by ion wake formation.

Frequency fluctuations of dust lattice modes linked to ion flow and 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.