Twisted Dust Acoustic Waves in Dusty Plasmas

TL;DR

This paper investigates linear dust acoustic waves in strongly coupled dusty plasmas, revealing their potential to form twisted vortex beams carrying orbital angular momentum, which can trap and transport dust particles.

Contribution

It introduces the concept of twisted dust acoustic vortex beams in dusty plasmas and analyzes their properties considering strong dust coupling and charge fluctuations.

Findings

DAWs can propagate as twisted vortex beams with OAM

Polarization force and dust coupling significantly affect DAW spectrum

Twisted DA vortex structures can trap and move dust particles

Abstract

We examine linear dust acoustic waves (DAWs) in a dusty plasma with strongly correlated dust grains, and discuss possibility of a twisted DA vortex beam carrying orbital angular momentum (OAM). For our purposes, we use the Boltzmann distributed electron and ion density perturbations, the dust continuity and generalized viscoelastic dust momentum equations, and Poisson's equation to obtain a dispersion relation for the modified DAWs. The effects of the polarization force, strong dust couplings, and dust charge fluctuations on the DAW spectrum are examined. Furthermore, we demonstrate that the DAW can propagate as a twisted vortex beam carrying OAM. A twisted DA vortex structure can trap and transport dust particles in dusty plasmas.