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Surface waves in magnetized quantum electron-positron plasmas

Published online by Cambridge University Press:  05 June 2009

A.P. MISRA
Affiliation:
Department of Mathematics, Visva-Bharati University, Santiniketan-731 235, India (apmisra@visva-bharati.ac.in)
N.K. GHOSH
Affiliation:
Gangapuri Siksha Sadan, Purba Putiary, Kolkata-700 093, India
P.K. SHUKLA
Affiliation:
Institut für Theoretische Physik IV and Centre for Plasma Science and Astrophysics, Fakultät für Physik and Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany (ps@tp4.rub.de)
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Abstract

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The dispersion properties of electrostatic surface waves propagating along the interface between a quantum magnetoplasma composed of electrons and positrons, and vacuum are studied by using a quantum magnetohydrodynamic plasma model. The general dispersion relation for arbitrary orientation of the magnetic field and the propagation vector is derived and analyzed in some special cases of interest (viz. when the magnetic field is directed parallel and perpendicular to the boundary surface). It is found that the quantum effects facilitate the propagation of electrostatic surface modes in a dense magnetoplasma. The effect of the external magnetic field is found to increase the frequency of the quantum surface wave. The existence of a singular wave on the boundary surface is also proved, and its properties are analyzed numerically. It is shown that the new wave characteristics appear due to the Rayleigh type of the wave.

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Copyright
Copyright © Cambridge University Press 2009