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Plasmons carrying orbital angular momentum in quantum plasmas

Published online by Cambridge University Press:  13 August 2013

SHABBIR A. KHAN ,
S. ALI  and
J. T. MENDONCA
SHABBIR A. KHAN
Affiliation:
National Centre for Physics, Quaid-i-Azam University Campus, Islamabad 45320, Pakistan (sakhan@ncp.edu.pk)
S. ALI
Affiliation:
National Centre for Physics, Quaid-i-Azam University Campus, Islamabad 45320, Pakistan (sakhan@ncp.edu.pk)
J. T. MENDONCA
Affiliation:
IPFN, Instituto Superior T′echnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
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Abstract

The existence of plasmons with orbital angular momentum due to the Laguerre–Gaussian-type density and potential perturbations is studied in an unmagnetized quantum plasma. Starting from appropriate hydrodynamic equations for the electrostatic electron dynamics, a dispersion equation is derived in paraxial approximation. The Laguerre–Gaussian beam solutions are obtained and the properties of electric field components, energy flux, and corresponding angular momentum density of plasmons are investigated. The electric field lines are found to form helical structures with a dominant axial component. The results are analyzed numerically and the influence of radial and angular mode numbers on potential and electric field components is illustrated.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Issue 5 , October 2013 , pp. 973 - 979
Copyright
Copyright © Cambridge University Press 2013 

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