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A Model Study of the Kohn Anomaly in the Optical Phonon Branch of a Binary Compound
Author(s) -
Fong C. Y.,
Weber W.
Publication year - 1980
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.2220990229
Subject(s) - anomaly (physics) , phonon , tight binding , binary number , physics , condensed matter physics , chain (unit) , matrix (chemical analysis) , materials science , chemistry , electronic structure , quantum mechanics , mathematics , arithmetic , composite material
Labbé's tight‐binding method is generalized and applied to a linear chain with two atoms per unit cell to study the Kohn anomaly in the optical phonon branch. The effects of various tight‐binding matrix elements on the anomaly are explored. The enhancement of anomaly can be effectively obtained by increasing the electron–phonon interactions.