Kinetic analysis of spin current contribution to spectrum of electromagnetic waves in spin-1/2 plasma, Part II: Dispersion dependencies

TL;DR

This paper investigates how spin polarization and magnetic moments influence the spectrum of high-frequency electromagnetic waves in spin-1/2 plasmas, revealing modifications in cyclotron and Bernstein wave spectra due to spin effects.

Contribution

It applies a quantum kinetic model to analyze the impact of spin dynamics and anomalous magnetic moments on wave dispersion in spin-polarized plasmas, detailing spectral modifications.

Findings

Spin polarization modifies cyclotron wave spectra.

Anomalous magnetic moments cause fine splitting of cyclotron resonances.

Spin effects alter Bernstein and extraordinary wave spectra.

Abstract

The dielectric permeability tensor for spin polarized plasmas derived in terms of the spin-1/2 quantum kinetic model in six-dimensional phase space in Part I of this work is applied for study of spectra of high-frequency transverse and transverse-longitudinal waves propagating perpendicular to the external magnetic field. Cyclotron waves are studied at consideration of waves with electric field directed parallel to the external magnetic field. It is found that the separate spin evolution modifies the spectrum of cyclotron waves. These modifications increase with the increase of the spin polarization and the number of the cyclotron resonance. Spin dynamics with no account of the anomalous magnetic moment gives a considerable modification of spectra either. The account of anomalous magnetic moment leads to a fine structure of each cyclotron resonance. So, each cyclotron resonance splits on three waves. Details of this spectrum and its changes with the change of spin polarization are studied for the first and second cyclotron waves. A cyclotron resonance existing at $\omega\approx0.001\mid\Omega_{e}\mid$ due to the anomalous magnetic moment is also described, where $\mid\Omega_{e}\mid$ is the cyclotron frequency. The ordinary waves does not have any considerable modification. The electrostatic and electromagnetic Berstein modes are studied during the analysis of waves propagating perpendicular to the external magnetic field with the electric field perturbation directed perpendicular to the external field. A modification of the oscillatory structure caused by the equilibrium spin polarization is found in both regimes. Similar modification is found for the extraordinary wave spectrum.