Spin-electron acoustic soliton and exchange interaction in separate spin evolution quantum plasmas

2017

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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 ω ≈ 0.001 | Ωe | due to the anomalous magnetic moment is also described, where | Ωe | 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.

Section: Wave Propagation Parallel To the External Magnetic Fieldmentioning

confidence: 99%

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

2017

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“…Next step in the development of models for the spin-1/2 quantum plasmas was the derivation of the separated spin evolution quantum hydrodynamics [25], [26] (see [27] for a generalized model with exchange interaction) and separated spin evolution quantum kinetics [28]. In this model the electrons are separated on two subspecies: electrons with spin-up and electrons with spindown [25,29].…”

Section: Introductionmentioning

confidence: 99%

Kinetic analysis of spin current contribution to spectrum of electromagnetic waves in spin-1/2 plasma. I. Dielectric permeability tensor for magnetized plasmas

2017

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The dielectric permeability tensor for spin polarized plasmas is derived in terms of the spin-1/2 quantum kinetic model in six-dimensional phase space. Expressions for the distribution function and spin distribution function are derived in linear approximations on the path of dielectric permeability tensor derivation. The dielectric permeability tensor is derived the spin-polarized degenerate electron gas. It is also discussed at the finite temperature regime, where the equilibrium distribution function is presented by the spin-polarized Fermi-Dirac distribution. Consideration of the spin-polarized equilibrium states opens possibilities for the kinetic modeling of the thermal spin current contribution in the plasma dynamics.

“…[8]. Since we are interested in analysis of the effects of Coulomb exchange interaction we use generalization of the SSE-QHD containing the exchange interaction [7]. However, Ref.…”

Section: Modelmentioning

confidence: 99%

“…However, Ref. [7] contains the exchange interaction for the three-dimensional electron gas. We need to substitute it in the similar way by the exchange interaction in two-dimensional electron gas in accordance with Refs.…”

Section: Modelmentioning

confidence: 99%

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Extraordinary waves in two dimensional electron gas with separate spin evolution and Coulomb exchange interaction

2017

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Hydrodynamics analysis of waves in two-dimensional degenerate electron gas with the account of separate spin evolution is presented. The transverse electric field is included along with the longitudinal electric field. The Coulomb exchange interaction is included in the analysis. In contrast with the three-dimensional plasma-like mediums the contribution of the transverse electric field is small. We show the decrease of frequency of both the extraordinary (Langmuir) wave and the spinelectron acoustic wave due to the exchange interaction. Moreover, spin-electron acoustic wave has negative dispersion at the relatively large spin-polarization. Corresponding dispersion dependencies are presented and analyzed.