Extraordinary and upper-hybrid waves in spin quantum magnetoplasmas with vacuum polarization effect

2021 ◽  
Vol 87 (4) ◽  
Author(s):  
Jun Zhu ◽  
Xiaoshan Liu ◽  
Yuee Luo
Keyword(s):  
Polarization Effect ◽  
Vacuum Polarization ◽  
Spin Current ◽  
Extraordinary Wave ◽  
Polarization Current ◽  
Relativistic Degeneracy ◽  
Bohm Potential ◽  
Spin Quantum ◽  
Degeneracy Pressure ◽  
Hybrid Waves

The propagation of extraordinary and upper-hybrid waves in spin quantum magnetoplasmas with vacuum polarization effect is investigated. Based on the quantum magnetohydrodynamics model including Bohm potential, arbitrary relativistic degeneracy pressure and spin force, and Maxwell's equations modified by the spin current and vacuum polarization current, the dispersion relations of extraordinary and upper-hybrid waves are derived. The analytical and numerical results show that quantum effects (Bohm potential, degeneracy pressure and spin magnetization energy) and the vacuum polarization effect modify the propagation of the extraordinary wave. Under the action of a strong magnetic field, the plasma frequency is obviously increased by the vacuum polarization effect.

Vacuum polarization effect in intense laser fields

2011 ◽  
Vol 23 (1) ◽  
pp. 217-220
Author(s):  
任娜 Ren Na ◽  
王加祥 Wang Jiaxiang ◽  
李安康 Li Ankang ◽  
李桂波 Li Guibo
Keyword(s):  
Polarization Effect ◽  
Vacuum Polarization ◽  
Intense Laser ◽  
Intense Laser Fields ◽  
Laser Fields

Impact of Relativistic Electron Beam on Hole Acoustic Instability in Quantum Semiconductor Plasmas

2018 ◽  
Vol 73 (2) ◽  
pp. 135-141 ◽  
Author(s):  
M. Siddique ◽  
M. Jamil ◽  
A. Rasheed ◽  
F. Areeb ◽  
Asif Javed ◽  
...  
Keyword(s):  
Electron Beam ◽  
Relativistic Electron ◽  
Relativistic Electron Beam ◽  
Semiconductor Plasma ◽  
Quantum Hydrodynamic Model ◽  
Bohm Potential ◽  
Plasma Species ◽  
Degeneracy Pressure ◽  
Quantum Semiconductor ◽  
Pressure Exchange

AbstractWe studied the influence of the classical relativistic beam of electrons on the hole acoustic wave (HAW) instability exciting in the semiconductor quantum plasmas. We conducted this study by using the quantum-hydrodynamic model of dense plasmas, incorporating the quantum effects of semiconductor plasma species which include degeneracy pressure, exchange-correlation potential and Bohm potential. Analysis of the quantum characteristics of semiconductor plasma species along with relativistic effect of beam electrons on the dispersion relation of the HAW is given in detail qualitatively and quantitatively by plotting them numerically. It is worth mentioning that the relativistic electron beam (REB) stabilises the HAWs exciting in semiconductor (GaAs) degenerate plasma.

Modulationally stable envelope solitons in astrophysical magnetoplasmas with degenerate relativistic electrons

2015 ◽  
Vol 81 (6) ◽  
Author(s):  
M. Irfan ◽  
S. Ali ◽  
Arshad M. Mirza ◽  
Yunliang Wang
Keyword(s):  
Perturbation Technique ◽  
Vital Role ◽  
Relativistic Electrons ◽  
Nls Equation ◽  
Weakly Nonlinear ◽  
Relativistic Degeneracy ◽  
Degeneracy Pressure ◽  
Relativistic Parameter ◽  
The One ◽  
Collective Interactions

The formation and propagation characteristics of small-amplitude magnetoacoustic dark/grey solitons are investigated in a semi relativistic degenerate magnetoplasma whose constituents are electrons and singly ionized positive ions. For this purpose, the electrons are assumed to follow the degeneracy pressure law through the Chandrasekhar equation of state, while the inertial cold ions are taken as non-degenerate and magnetized. By solving the one-fluid quantum magnetohydrodynamic (QMHD) model with the aid of a reductive perturbation technique, a nonlinear Schrödinger (NLS) equation is derived for weakly nonlinear envelope magnetoacoustic solitons. The NLS equation admits the existence of stable excitations, e.g. dark and grey solitons for which the condition $P/Q<0$ holds. Numerical results reveal that the variation of plasma number density, magnetic field strength, relativistic parameter $({\it\eta}_{e0})$ and the quantum parameter $(H)$ significantly modify the profiles of the envelope magnetoacoustic solitons. The present results are important to understanding of the nonlinear dynamics of magnetoacoustic solitons in astrophysical dense magnetoplasmas (viz., white dwarfs, magnetars, neutron stars, etc.), where the relativistic degeneracy effects play a vital role in collective interactions.

scholarly journals ENTROPY OF SCALAR FIELD NEAR A SCHWARZSCHILD BLACK HOLE HORIZON

2006 ◽  
Vol 21 (30) ◽  
pp. 6183-6190 ◽  
Author(s):  
M. R. SETARE
Keyword(s):  
Black Hole ◽  
Scalar Field ◽  
Spherical Shell ◽  
Polarization Effect ◽  
Vacuum Polarization ◽  
Mixed Boundary Condition ◽  
Mixed Boundary ◽  
Massive Scalar ◽  
Schwarzschild Black Hole ◽  
Massive Scalar Field

In this paper we compute the correction to the entropy of Schwarzschild black hole due to the vacuum polarization effect of massive scalar field. The Schwarzschild black hole is supposed to be confined in spherical shell. The scalar field obeying mixed boundary condition on the spherical shell.

scholarly journals Vacuum Polarization Effect on the Chiral Bag Model with ω Meson

1987 ◽  
Vol 78 (6) ◽  
pp. 1392-1404 ◽  
Author(s):  
Shin-ichi Yoro ◽  
Toshitaka Tatsumi
Keyword(s):  
Polarization Effect ◽  
Vacuum Polarization ◽  
Bag Model

SPIN CURRENT AMPLIFICATION IN PRESENCE OF NONUNIFORM DOPING

2012 ◽  
Vol 26 (04) ◽  
pp. 1150026
Author(s):  
SH. MIRZAEE ◽  
H. RAHIMPOUR SOLEIMANI
Keyword(s):  
Spin Polarization ◽  
Continuity Equation ◽  
Spin Current ◽  
Polarization Current ◽  
Spintronic Devices ◽  
The Poisson Equation ◽  
Polarization Density ◽  
Amplifying Effect ◽  
Current Amplification ◽  
First Time

In this paper, for the first time in our knowledge, the influence of nonuniform and continuous doping in semiconductor on amplification of spin polarization current especially in n-type GaAs semiconductor have been studied. Numerical calculations based on a selfconsistent solution of the continuity equation, the Poisson equation and rate-equation are used to explain the amplification of spin polarization density. The influences of the diffusion coefficient (Dn) and relaxation time (τsf) on the spin polarization density are also studied. The amplifying effect of nonuniform doping on spin polarization density is important because it might have many applications in spintronic devices.

scholarly journals Separated spin evolution quantum hydrodynamics of degenerate electrons with spin–orbit interaction and extraordinary wave spectrum

2018 ◽  
Vol 84 (5) ◽  
Author(s):  
Pavel A. Andreev ◽  
Mariya Iv. Trukhanova
Keyword(s):  
Wave Spectrum ◽  
Spin Current ◽  
Extraordinary Wave ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Quantum Hydrodynamics ◽  
Pauli Equation ◽  
Spin Orbit Interaction ◽  
Spin Evolution ◽  
Electron Acoustic Wave

To consider the contribution of the spin–orbit interaction in the extraordinary wave spectrum we derive a generalization of the separate spin evolution quantum hydrodynamics. Applying the corresponding nonlinear Pauli equation we include the Fermi spin current contribution in the spin evolution. We find that the spectrum of extraordinary waves consists of three branches: two of them are well-known extraordinary waves and the third one is the spin-electron acoustic wave. A change of the extraordinary wave spectrum due to the spin–orbit interaction is also obtained.

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