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Dielectric function and plasmon excitations in silver
Author(s) -
Fehrenbach G. M.,
Bross H.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221930124
Subject(s) - plasmon , excitation , dielectric function , surface plasmon , plane wave , dielectric , physics , wave vector , localized surface plasmon , diagonal , surface plasmon polariton , condensed matter physics , optics , quantum mechanics , mathematics , geometry
The microscopic dielectric function of silver is investigated in the framework of the time‐dependent density‐functional theory underlying a spline augmented plane‐wave band calculation. A reasonable overall agreement is found when comparing our results with experimental data. Small systematic errors in the position of the peaks can be ascribed to the local density approximation. It is shown that in the long‐wave limit a zero of the diagonal element corresponds to a plasmon excitation. The frequency of the q = 0 plasmon excitation agrees quite well with its experimental value. No plasmon excitation can be found even for small values of the propagation vector.