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Dispersion relations of elementary excitations when damping is present
Author(s) -
Ritchie R. H.,
Hamm R. N.,
Williams M. W.,
Arakawa E. T.
Publication year - 1977
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.2220840139
Subject(s) - dispersion relation , dispersion (optics) , surface plasmon , excitation , momentum (technical analysis) , plasmon , condensed matter physics , dielectric , foil method , materials science , physics , optics , quantum mechanics , composite material , finance , economics
Dispersion relations of elementary excitations in solids when appreciable damping occurs are discussed. It is shown that in order to establish a dispersion relation from experiment it is necessary to specify how the experiment was performed; different experiments may lead to different dispersion relations even when a single kind of elementary excitation is involved. “Momentum‐fixed” dispersion relations and “energy‐fixed” dispersion relations are discussed for the surface plasmon at a single isolated metal‐vacuum interface and for the surface plasmon at the metal‐vacuum interface of a thin metal foil bounded by a transparent dielectric on one side and by vacuum on the other.