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Lineshape of Light Absorption by Thermalized Frenkel Excitons under Band‐to‐Band Transitions
Author(s) -
Grigorchuk N. I.,
Grechko L. G.
Publication year - 1989
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.2221530221
Subject(s) - exciton , thermalisation , bandwidth (computing) , physics , absorption (acoustics) , biexciton , absorption band , lattice (music) , condensed matter physics , atomic physics , molecular physics , chemistry , optics , telecommunications , computer science , acoustics
It is assumed that sublevels of the lowest exciton band in consequence of pumping are filled by excitons, which thermalize during their lifetime. The probability of throwing of such excitons to the next more higher lying band by means of another radiation source is investigated. By simple assumptions, when the distance between the exciton bands is much greater than the bandwidth difference and the damping parameter is independent of the frequency, the lineshape of light absorption under band‐to‐band transitions is calculated. For small damping in the case of broad bandwidth it is shown that the absorption is determined rather by temperature of the crystal than by bandwidth difference. In the case of narrow bands only that difference plays the essential role.