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Title: Surface plasmon oscillations on a quantum plasma half-space

Abstract

We investigate the propagation of surface electrostatic oscillations on a quantum plasma half-space, taking into account the quantum effects. We derive the quantum surface wave frequencies of the system, by means the quantum hydrodynamic theory in conjunction with the Poisson equation and applying the appropriate additional quantum boundary conditions. Numerical results show in the presence of the slow nonlocal variations, plasmon wave energies of the system are significantly modified and plasmonic oscillations with blue-shifted frequencies emerge.

Authors:
 [1];  [2]
  1. Department of Engineering Physics, Kermanshah University of Technology, Kermanshah (Iran, Islamic Republic of)
  2. (IPM), Tehran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22408037
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOUNDARY CONDITIONS; OSCILLATIONS; POISSON EQUATION; QUANTUM PLASMA; SURFACES; WAVE PROPAGATION

Citation Formats

Moradi, Afshin, E-mail: a.moradi@kut.ac.ir, and Department of Nano Sciences, Institute for Studies in Theoretical Physics and Mathematics. Surface plasmon oscillations on a quantum plasma half-space. United States: N. p., 2015. Web. doi:10.1063/1.4906054.
Moradi, Afshin, E-mail: a.moradi@kut.ac.ir, & Department of Nano Sciences, Institute for Studies in Theoretical Physics and Mathematics. Surface plasmon oscillations on a quantum plasma half-space. United States. doi:10.1063/1.4906054.
Moradi, Afshin, E-mail: a.moradi@kut.ac.ir, and Department of Nano Sciences, Institute for Studies in Theoretical Physics and Mathematics. Thu . "Surface plasmon oscillations on a quantum plasma half-space". United States. doi:10.1063/1.4906054.
@article{osti_22408037,
title = {Surface plasmon oscillations on a quantum plasma half-space},
author = {Moradi, Afshin, E-mail: a.moradi@kut.ac.ir and Department of Nano Sciences, Institute for Studies in Theoretical Physics and Mathematics},
abstractNote = {We investigate the propagation of surface electrostatic oscillations on a quantum plasma half-space, taking into account the quantum effects. We derive the quantum surface wave frequencies of the system, by means the quantum hydrodynamic theory in conjunction with the Poisson equation and applying the appropriate additional quantum boundary conditions. Numerical results show in the presence of the slow nonlocal variations, plasmon wave energies of the system are significantly modified and plasmonic oscillations with blue-shifted frequencies emerge.},
doi = {10.1063/1.4906054},
journal = {Physics of Plasmas},
number = 1,
volume = 22,
place = {United States},
year = {Thu Jan 15 00:00:00 EST 2015},
month = {Thu Jan 15 00:00:00 EST 2015}
}
  • We studied the surface plasmon waves in a quantum plasma half-space by considering the effects of exchange and correlation for the electrons. We used a quantum hydrodynamic approach, including the full set of Maxwell equations and considering two new quantities (measuring the exchange and correlation effects) in addition to the Fermi electron temperature and the quantum Bohm potential, to derive the dispersion relation for the surface plasmon waves. It was found that the exchange-correlation effects significantly modified the behavior of surface plasmon waves. We showed that the frequency of surface plasmon wave was down-shifted by the exchange-correlation effects. On themore » other hand, the quantum effects (including of the exchange-correlation effects and the quantum Bohm potential) was seen to cause an increase in the phase speed of surface plasmon waves. Our results can help to understand the propagation properties of surface waves in intense laser produced solid density plasmas and metallic plasmas.« less
  • Surface modes are coupled electromagnetic/electrostatic excitations of free electrons near the vacuum-plasma interface and can be excited on a sufficiently dense plasma half-space. They propagate along the surface plane and decay in either sides of the boundary. In such dense plasma models, which are of interest in electronic signal transmission or in some astrophysical applications, the dynamics of the electrons is certainly affected by the quantum effects. Thus, the dispersion relation for the surface wave on a quantum electron plasma half-space is derived by employing the quantum hydrodynamical (QHD) and Maxwell-Poisson equations. The QHD include quantum forces involving the Fermimore » electron temperature and the quantum Bohm potential. It is found that, at room temperature, the quantum effects are mainly relevant for the electrostatic surface plasma waves in a dense gold metallic plasma.« less
  • The propagation of surface waves on a quantum plasma half-space is investigated, taking into account the electron exchange-correlation effect. Using the modified quantum hydrodynamic model in conjunction with the Poisson equation, the dispersion relation of surface waves is obtained. It is found that due to the presence of electron exchange-correlation effect the wave frequency is shifted to lower frequencies. For different ranges of Brueckner parameter r{sub s}, the effect of electron exchange-correlation is investigated. It is indicated that for weak coupling region with r{sub s} < 0.1, the wave frequency remains unchanged and in this region the effect of electron exchange-correlation ismore » negligible. For moderate coupling region, i.e., (0.1 < r{sub s} < 1), the influence of electron exchange-correlation is important and as r{sub s} increases, the electron exchange-correlation effect also increases.« less
  • A theory of electrostatic surface waves on a quantum plasma half-space is developed with the inclusion of external magnetic field effects for the geometry in which the magnetic field is parallel to the surface and the direction of propagation is perpendicular to the magnetic field. A general analytical expression for dispersion relation of surface waves is obtained by solving Poisson and quantum magnetohydrodynamic equations with appropriate quantum boundary conditions.
  • The main differences between our work [H. Khalilpour, Phys. Plasmas 22, 122112 (2015)] and the work of Shahmansouri [Phys. Plasmas 22, 092106 (2015)] are summarized. Also, the validity of the pre-factor 1/9 in front of Bohm potential is discussed.