Spin-induced localized density excitations in quantum plasmas

TL;DR

This paper investigates how electron inertia and spin effects influence localized density excitations in quantum plasmas, revealing the critical role of quantum magnetism and system dimensionality in soliton stability.

Contribution

It introduces a quantum magnetohydrodynamics model that incorporates electron tunneling and spin polarization to analyze soliton existence and stability in quantum plasmas.

Findings

Quantum effects like paramagnetism and diamagnetism affect soliton criteria.

Soliton stability varies with quantum system dimensionality.

Soliton amplitude responds differently to magnetic field depending on electron effective mass.

Abstract

In this paper the dominant effect of electron inertia on the dynamics of localized density excitations is studied in a quantum plasma in the presence of electron spin effects. Using the quantum magnetohydrodynamics (QMHD) model including electron tunneling and spin polarization phenomena, it is revealed that the quantum effects such as plasma paramagnetism and diamagnetism play inevitable role on soliton existence criteria in quantum plasmas. Furthermore, it is shown that the magnetosonic localized density-excitation stability depends strongly on the quantum system dimensionality. Two distinct region of soliton stability is shown to exist depending on the value of the electron effective mass, where, the soliton amplitude variation with respect to the external magnetic field strength is quite opposite in these regions. Current findings can be important in the study of dynamical nonlinear wave features in dense laboratory or inertial-confined plasmas.