Surface plasma wave in spin-polarized semiconductor quantum plasma

AbstractThe possibilities of surface plasma wave (SPW) on a metal-vacuum interface in semiconductor quantum plasma by considering the effects of Coulomb exchange (CE) interaction and the spin-polarization has been explored. The dispersion for the SPW has been setup using the modified quantum hydrodynamic (QHD) model taking into account the Fermi pressure, the quantum Bohm force, the CE, and the electron spin. The optical gain of SPW has been evaluated. It is found that CE effects and spin-polarization increases the wave frequency and enhances the gain during the stimulated emission.

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A mechanism for spin electron acoustic soliton observed in a spin polarized nanosized electron-hole plasma

Physica Scripta ◽

10.1088/1402-4896/ac4551 ◽

2021 ◽

Author(s):

Mahmoud Saad Afify ◽

Zafar Iqbal ◽

Ghulam Murtaza

Keyword(s):

Maxwell Equations ◽

Kdv Equation ◽

Reductive Perturbation Method ◽

Electron Hole ◽

Hole Plasma ◽

Electron Hole Plasma ◽

Spin Polarized ◽

Qhd Model ◽

Quantum Hydrodynamic ◽

Electron Acoustic

Abstract The formation and the characteristics of spin electron acoustic (SEA) soliton in a beam interacting spin polarized electron-hole plasma are investigated. These wavepackets are supposed to be the source of heating during the excitation process. We have used the separate spin evolution-quantum hydrodynamic (SSE-QHD) model along with Maxwell equations and derived the Korteweg-de Vries (KdV) equation by using the reductive perturbation method (RPM). We note that the larger values of beam density and spin polarization can change the soliton nature from rarefactive to compressive. Our findings may be important to understand the characteristics of localized spin dependent nonlinear waves in nanosized semiconductor devices.

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Propagation of TE-Surface Waves on Semi-Bounded Quantum Plasma

International Journal of Plasma Science and Engineering ◽

10.1155/2010/693049 ◽

2010 ◽

Vol 2010 ◽

pp. 1-4 ◽

Cited By ~ 14

Author(s):

B. F. Mohamed ◽

M. Abdel Aziz

Keyword(s):

Magnetic Field ◽

Surface Waves ◽

Electric Fields ◽

Quantum Plasma ◽

Surface Modes ◽

Bohm Potential ◽

Quantum Electron ◽

Qhd Model ◽

Quantum Hydrodynamic ◽

Unmagnetized Plasma

The propagation of the TE-surface waves on a semibounded quantum plasma is investigated by using the system of generalized quantum hydrodynamic (QHD) model and Maxwell's equations. The dispersion relations for these surface waves on quantum electron plasma in the presence of external magnetic field which is parallel to the wave propagation are derived. The perturbation of electron density and the electric fields of the TE-surface waves are also obtained. However, it was found that quantum effects (Bohm potential and statistical) have no remarkable action on the electric and magnetic field components in the case of unmagnetized plasma. But, it was found that the dispersion relation of surface modes depends significantly on these effects in the case of electrostatic or unmagnetized plasma.

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Envelope solitons at a plasma–vacuum interface

Journal of Plasma Physics ◽

10.1017/s0022377807006939 ◽

2008 ◽

Vol 74 (2) ◽

pp. 151-154 ◽

Cited By ~ 1

Author(s):

P. K. SHUKLA ◽

L. STENFLO

Keyword(s):

Surface Wave ◽

Electric Field ◽

Plasma Wave ◽

Complex Surface ◽

Surface Plasma ◽

Envelope Soliton ◽

Envelope Solitons ◽

Vacuum Interface ◽

Nonlinear Surface

AbstractIt is shown that a nonlinear surface plasma wave at a plasma–vacuum interface can propagate in the form of a dark/grey envelope soliton. The latter is associated with a subsonic density cavity, which traps the complex surface wave electric field.

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Signature of Generalized Gibbs Ensemble Deviation from Equilibrium: Negative Absorption Induced by a Local Quench

Entropy ◽

10.3390/e23020220 ◽

2021 ◽

Vol 23 (2) ◽

pp. 220

Author(s):

Lorenzo Rossi ◽

Fabrizio Dolcini ◽

Fabio Cavaliere ◽

Niccolò Traverso Ziani ◽

Maura Sassetti ◽

...

Keyword(s):

Optical Gain ◽

Electron System ◽

Bound State ◽

Stimulated Emission ◽

Optical Measurements ◽

Gibbs Ensemble ◽

Attractive Potential ◽

Dimensional Electron System ◽

Constants Of Motion ◽

Generalized Gibbs Ensemble

When a parameter quench is performed in an isolated quantum system with a complete set of constants of motion, its out of equilibrium dynamics is considered to be well captured by the Generalized Gibbs Ensemble (GGE), characterized by a set {λα} of coefficients related to the constants of motion. We determine the most elementary GGE deviation from the equilibrium distribution that leads to detectable effects. By quenching a suitable local attractive potential in a one-dimensional electron system, the resulting GGE differs from equilibrium by only one single λα, corresponding to the emergence of an only partially occupied bound state lying below a fully occupied continuum of states. The effect is shown to induce optical gain, i.e., a negative peak in the absorption spectrum, indicating the stimulated emission of radiation, enabling one to identify GGE signatures in fermionic systems through optical measurements. We discuss the implementation in realistic setups.

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