Collective excitations of rotating dusty plasma under quasi-localized charge approximation of strongly coupled systems

TL;DR

This paper investigates the collective excitations in rotating dusty plasmas using the quasi-localized charge approximation, highlighting the effects of rotation on dispersion relations and establishing a connection with experimental observations.

Contribution

It introduces a finite rotation version of dispersion relations in strongly coupled dusty plasmas within the QLCA framework, linking experimental data with theoretical models.

Findings

Derivation of rotation-dependent dispersion relations for dusty plasmas.

Identification of a correspondence between faster rotating weakly coupled and strongly coupled branches.

Validation of theoretical dispersions with experimental measurements in rotating plasmas.

Abstract

Collective excitations of rotating dusty plasma are analyzed under the quasi localized charge approximation (QLCA) framework for strongly coupled systems by explicitly accounting for the dust rotation in the analysis. Considering the firm analogy of magnetoplasmons with "rotoplasmons" established by the recent rotating dusty plasma experiments, the relaxation introduced by the rotation in their strong coupling and 2-dimensional (often introduced by gravitational sedimentation) characteristics is emphasized in their dispersion. Finite rotation version of both strong and weak coupling dispersions is derived and analyzed, showing correspondence between a `faster rotating but weakly coupled' branch and its strongly coupled counterpart, relevant to both magnetized and unmagnetized dust experiments, in gravity or microgravity conditions. The first correspondence between their measurements in rotating plasmas and the QLCA produced dispersions in a rotating frame, with an independent numerical validation, is presented in detail.