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Phonon‐assisted exciton annihilation in CdSe crystals
Author(s) -
Abramov V. A.,
Permogorov S. A.,
Razbirin B. S.,
Ekimov A. I.
Publication year - 1970
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.19700420216
Subject(s) - annihilation , exciton , phonon , line (geometry) , condensed matter physics , physics , momentum (technical analysis) , kinetic energy , spectral line , biexciton , atomic physics , quantum mechanics , geometry , mathematics , finance , economics
Abstract Emission spectra of exciton annihilation are measured in CdSe crystals from 2 to 77 °K. Especially the line‐shape, due to exciton annihilation with simultaneous creation of one or two phonons is considered. This shape can adequately be described on the basis of energy and momentum conservation laws only if the momentum dependence of the exciton‐phonon interaction probability is properly taken into account. As a result analytical expressions E 3/2 exp (– E/kT ) for the one‐phonon line and E 1/2 exp (– E/kT ) for the two‐phonon line, where E is the exciton kinetic energy, are obtained. An additional broadening of exciton emission lines, clearly observed at lower temperatures, is assigned to the inherent width of exciton levels.