Kinetic description of the oblique propagating spin-electron acoustic waves in degenerate plasmas

TL;DR

This paper develops a quantum kinetic model to analyze oblique propagating spin-electron acoustic waves in degenerate magnetized plasmas, deriving a dispersion relation and examining how wave properties depend on system parameters.

Contribution

It introduces a kinetic description considering separate spin evolution for electrons and derives an analytical dispersion relation for oblique spin-electron acoustic waves.

Findings

Increasing the propagation angle reduces wave frequency and damping.

Higher spin polarization decreases wave frequency and damping.

The wave frequency's imaginary part shows a nonmonotonic dependence on wave vector.

Abstract

Oblique propagation of the spin-electron acoustic waves in degenerate magnetized plasmas is considered in terms of quantum kinetics with the separate spin evolution, where the spin-up electrons and the spin-down electrons are considered as two different species with different equilibrium distributions. It is considered in the electrostatic limit. Corresponding dispersion equation is derived. Analytical analysis of the dispersion equation is performed in the long-wavelength limit to find an approximate dispersion equation describing the spin-electron acoustic wave. The approximate dispersion equation is solved numerically. Real and imaginary parts of the spin-electron acoustic wave frequency are calculated for different values of the parameters describing the system. It is found that the increase of angle between direction of wave propagation and the external magnetic field reduces the real and imaginary parts of spin-electron acoustic wave frequency. The increase of the spin polarization decreases the real and imaginary parts of frequency either. The imaginary part of frequency has nonmonotonic dependence on the wave vector which shows a single maximum. The imaginary part of frequency is small in compare with the real part for all parameters in the area of applicability of the obtained dispersion equation.