Absorption of low-frequency radiation by small metal particles: a semiclassical random-phase-approximation

M Wilkinson, B Mehlig

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Calculations of low-frequency absorption of electromagnetic radiation by small conducting particles must take account of screening of the externally applied field due to polarization charges. In this paper we introduce a 'semiclassical' variant of the random-phase-approximation (RPA) method for obtaining the self-consistent field. Electric and magnetic dipole absorption are treated within a unified scheme, and we also demonstrate the equivalence of this approach to a superficially dissimilar perturbative method. The approach is more tractable than the full RPA equations, and allows us to discuss the effective potential for both diffusive and ballistic electron dynamics.
Original languageEnglish
Pages (from-to)10481-10498
Number of pages18
JournalJournal of Physics: Condensed Matter
Issue number50
Publication statusPublished - 18 Dec 2000


  • electromagnetic radiation
  • polarization
  • magnetic dipole absorption
  • ballistic electron dynamics


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