The Propagation Of Linear Waves In Spin Quantum Plasmas

Exploring the propagation properties of linear waves in spin quantum plasmas is presented,in this work.This theoretical investigate provides an important reference for an experimental investigate on the intense laser-solid density plasma interaction and also useful for comprehending the propagation properties of the high-frequency waves in dense astrophysical objects.In the introductory,the definition of classical plasma,the description method of classical plasma,Debye shielding,plasma characteristics,spatial and temporal scales of plasma and the basis of plasma judgment are introduced.In plasma physics,for plasmas inside celestial bodies,the investigate conditions are different from those of classical plasmas,plasmas are often low temperature and dense and need to be described by quantum theory.When the De Broglie wavelength can compared with the scale of the studied system,the quantum effect begins to arise and such plasmas are usually called quantum plasmas.According to the survey recognize that the Wigner-Poisson model,the Schr(?)dinger-Poisson model and the quantum hydrodynamics model are the main models for studying quantum plasmas at this stage.Quantum hydrodynamic models are widely applied to transport,fluctuations and instabilities of quantum plasma species.Utilization the quantum magnetohydrodynamic model constructed based on the continuity equation,momentum equation,and Maxwell’s equation,the effects of quantum effects(including the Bohm potential,the relativistic degeneracy pressure of electrons and electron-1/2 spin effect)on the linear wave propagation characteristics in the spin-quantum plasma are investigated.The dispersion equations of the spin-quantum magnetic plasma are derived based on the quantum magnetohydrodynamic model,the quantum effects and the Maxwell’s set of equations modified by the spin current density.Solving the dispersion equation in the case of propagation parallel or perpendicular to the background magnetic field,dispersion relations of left-handed wave,right-handed wave,upper hybrid wave,ordinary and extraordinary waves are derived,respectively.The research has indicates that the quantum effects do not affect the propagation of the left-handed wave,right-handed wave and ordinary wave.It was also found that the upper hybrid oscillation could propagate in cold plasmas due to the presence of the Bohm potential and the Fermi simplex pressure.Since the extraordinary wave consists of partial transverse and longitudinal waves,the quantum effects can modify the dispersion relation of the extraordinary wave.