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The Narrow Bands of Exciton Absorption in Polar Solids and Alloys
Author(s) -
Kusmartsev F. V.
Publication year - 1985
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.2221310224
Subject(s) - exciton , absorption (acoustics) , polar , biexciton , rydberg formula , attenuation coefficient , condensed matter physics , materials science , atomic physics , molecular physics , chemistry , physics , optics , ionization , quantum mechanics , ion , composite material , organic chemistry
An analytical theory of the Urbach‐Martienssen tail for the Wannier‐Mott excitons in polar crystals and alloys is developed on the basis of the expansion of all quantities in the small parameter δ ≪ E i( μ/M ), where M and μ are the translation and the reduced masses of the exciton; E i is the exciton Rydberg, and δ is the photon deficit. The exciton absorption coefficient and the length of the absorption tail are calculated. The latter characterizes the width of the exciton absorption band. The results obtained are compared with experiments on the exciton absorption in layered polar crystals.