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Title: Study of Collective Modes in Quantum Plasmas
Authors: Siddique, Muhammad
Keywords: Physical Sciences
Issue Date: 2020
Publisher: Government College University, Faisalabad
Abstract: We have 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) stabilizes the HAWs exciting in semiconductor (GaAs) degenerate plasma. Also we have investigated the effect of exchange-correlation potential (ECP) and Bohm potential on the profile of dust acoustic solitary waves (DASWs) in dusty plasma containing degenerate electrons and ions. The present study focuses on the linear and nonlinear long wavelength dust acoustic waves in non-relativistic plasmas. The linear acoustic waves have been analyzed through the multi-fluid model, whereas the reductive perturbation theory is applied to derive a modified Korteweg-de Vries (KdV) equation for small but finite amplitude waves. The effects of dust concentration and the exchange correlation potential have been investigated. These parameters remarkably change the amplitude and the width of the solitary waves. The findings from this investigation may lead to further understanding of the characteristics of nonlinear electrostatic waves exciting in the dense Fermi gas which is present in metallic nano structures or in near super novae environment in the presence of massive charge defects.
Gov't Doc #: 21779
Appears in Collections:PhD Thesis of All Public / Private Sector Universities / DAIs.

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