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Electronic Correlation Effects (Exciton Manifestation) in the Single‐Particle Band Structure of Nonmetallic Crystals II. Investigation of a Model
Author(s) -
Zimmermann R.
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.2220610207
Subject(s) - exciton , electronic band structure , insulator (electricity) , binding energy , spectral function , molecular physics , alkali metal , condensed matter physics , halide , spectral line , chemistry , materials science , physics , atomic physics , quantum mechanics , inorganic chemistry , optoelectronics
The appearance of excitonic satellites is the most pronounced feature due to electron correlation in the band structure of nonmetallic crystals. The general theory presented in a foregoing paper [1] is applied to a model of an insulator with parameter values appropriate to the alkali halide CsI. Only four bands with tight‐binding energies and one exciton line are taken into account. Numerical results are given for self‐energy, spectral function, and density of states in the main bands and the satellite bands.