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Self‐Consistent Phonon Width Calculations in Alkali Halides
Author(s) -
Fischer K.
Publication year - 1974
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.2220660206
Subject(s) - anharmonicity , phonon , line (geometry) , halide , line width , function (biology) , condensed matter physics , constant (computer programming) , physics , self energy , harmonic , atomic physics , quantum mechanics , chemistry , mathematics , optics , geometry , evolutionary biology , computer science , biology , programming language , electron , inorganic chemistry
The cubic anharmonic phonon decay process is reinvestigated. The δ‐functions which describe energy conservation in the harmonic approximation are replaced by Lorentzians in the self‐consistent theory, whose widths are given by the sum of the line widths of the interacting phonons. For KI at room temperature, the critical points in the damping function are “washed out” almost completely by this line broadening effect and the shift function is reduced considerably, as compared to conventional calculations with constant width parameters.