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Instability of modified Zakharov-Kuznetsov solitons in an inhomogeneous partially degenerate electron-ion magnetoplasma.
Phys Rev E
December 2022
Department of Physics, University of Malakand Chakdara Dir(L), Khyber Pakhtun Khwa 18800, Pakistan.
Linear and nonlinear propagation characteristics of multidimensional drift ion-acoustic (IA) solitons are studied in an inhomogeneous partially degenerate electron-ion magnetoplasma. A modified Zakharov-Kuznetsov (mZK) equation is deduced, accounting for the longitudinal as well as the transverse dispersions. It is shown that the mZK equation admits a distinct solution, revealing excitation of a pulse-shaped soliton when the phase speed exceeds by the wave dispersion.
View Article and Find Full Text PDFNonlinear excitations of magnetosonic solitary waves and their chaotic behavior in spin-polarized degenerate quantum magnetoplasma.
Chaos
February 2021
Department of Physics, University of Peshawar, Peshawar 25000, Pakistan.
The quantum hydrodynamic model is used to study the nonlinear propagation of small amplitude magnetosonic solitons and their chaotic motions in quantum plasma with degenerate inertialess spin-up electrons, spin-down electrons, and classical inertial ions. Spin effects are considered via spin pressure and macroscopic spin magnetization current, whereas the exchange effects are considered via adiabatic local density approximation. By applying the reductive perturbation method, the Korteweg-de Vries type equation is derived for small amplitude magnetosonic solitary waves.
View Article and Find Full Text PDFIon-acoustic dipolar vortex in degenerate magnetoplasma with ions/electrons thermal corrections.
Chaos
July 2020
Theoretical Plasma Physics Group, Department of Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan.
Nonlinear evolution and propagation characteristics of an ion-acoustic (IA) dipolar vortex are examined in a magnetoplasma that comprises partially degenerate electrons and dynamic ions. The adiabatic ions reduce the quantum magnetohydrodynamic equations to a modified momentum equation. The latter admits a new solution and leads to an evolution equation for the description of a coherent IA dipolar vortex.
View Article and Find Full Text PDFThree dimensional ion-acoustic rogons in quantized anisotropic magnetoplasmas with trapped/untrapped electrons.
Chaos
October 2019
College of Sciences and Humanities Studies Al-Kharj, Physics Department, Prince Sattam Bin Abdulaziz University, Al Kharj 11942, Saudi Arabia.
Three-dimensional (3D) modulational instability (MI) and ion-acoustic (IA) envelopes are studied in a quantized degenerate magnetoplasma, whose constituents are the trapped/untrapped electrons and anisotropic positive ions. By using quantum hydrodynamic equations and the multiscale reductive perturbation technique, a 3D nonlinear Schrödinger equation is derived to account for electron quantization and ion pressure anisotrophy effects. The potential excitations are shown stable (unstable) against the perturbations for K<0(K>0), where K is a critical parameter that accounts for the longitudinal (transverse) dispersion(s) and nonlinearity effects.
View Article and Find Full Text PDFCyclotron resonance in the high mobility GaAs/AlGaAs 2D electron system over the microwave, mm-wave, and terahertz- bands.
Sci Rep
February 2019
Georgia State University, Dept. of Physics and Astronomy, Atlanta, 30303, USA.
The reflected microwave power from the photo-excited high mobility GaAs/AlGaAs 2D device has been measured over the wide frequency band spanning from 30 to 330 GHz simultaneously along with diagonal magnetoresistance as a function of the magnetic field. Easily distinguishable resonances in the reflected power signal are observed at the same magnetic fields as a reduced amplitude in the Shubnikov-de Haas (SdH) oscillations of the diagonal magnetoresistance. The reflection resonances with concurrent amplitude reduction in SdH oscillations are correlated with cyclotron resonance induced by microwave, mm-wave, and terahertz photoexcitation.
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