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Exchange Contributions and Plasmon Spectra of One‐Dimensional Systems
Author(s) -
Brosens F.,
Devreese J. T.,
Kahn L. M.,
Ruvalds J.
Publication year - 1982
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.2221110110
Subject(s) - plasmon , decoupling (probability) , energy exchange , long wavelength limit , dielectric function , dispersion (optics) , wavelength , electron , physics , condensed matter physics , molecular physics , dielectric , atomic physics , optics , optoelectronics , quantum mechanics , atmospheric sciences , control engineering , engineering
The dynamical exchange decoupling method for including exchange in the dielectric function of the electron gas is applied to one‐dimensional systems with a tight‐binding energy band. Depending on the bandwidth and the position of the Fermi energy in the band, dynamical exchange effects are shown to have appreciable effects on the plasmon dispersion. For propagation of the plasmon along the strand axis, and in the long‐wavelength limit, exchange effects drastically lower the slope of the plasmon dispersion. For non‐parallel incidence, the exchange effects are less pronounced, and extended over a smaller wave vector region.