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

Wikinson, M. and Mehlig, B. (2000). Absorption of low-frequency radiation by small metallic particles: a semiclassical random phase approximation. Journal of Physics: Condensed Matter, 12(50) pp. 10481–10498.

DOI: https://doi.org/10.1088/0953-8984/12/50/310

Abstract

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.

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