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Evidence of coulomb interaction at the e 1 interband transition of hexagonal CdSe
Author(s) -
Lange H.,
Iliev I. A.
Publication year - 1977
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.2220840220
Subject(s) - coulomb , exciton , binding energy , spectral line , absorption edge , refractive index , hexagonal crystal system , condensed matter physics , reflection (computer programming) , atomic physics , band gap , attenuation coefficient , line (geometry) , electron , absorption (acoustics) , materials science , molecular physics , chemistry , physics , optics , crystallography , programming language , quantum mechanics , computer science , geometry , mathematics , astronomy
Transmission and reflection spectra are measured on CdSe single crystals in the region 3.6 to 5.9 eV at 109 K and RT and the absorption coefficient, refractive index, and real and imaginary part of the DF are calculated from these data. The line shape of ϵ 2 around the E 1 (B) peak indicates a strong influence of electron–hole interaction. A comparison with Kane's theory gives a binding energy of the two‐dimensional exciton of 0.23 eV. In thermally modulated transmission spectra a new structure is observed which is attributed to the M 1 edge of the E 1 (A 2 ) exciton yielding a binding energy of the same magnitude.