Fluctuation states and optical spectra of solid solutions with a strong isoelectronic perturbation |
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Authors: | A A Klochikhin S A Permogorov A N Reznitskii |
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Institution: | (1) Institute of Nuclear Physics, Russian Academy of Sciences, 188350 Gatchina, St. Petersburg, Russia;(2) A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia |
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Abstract: | We propose an approach to describing the density of fluctuation states in a disordered solid solution with a strong perturbation
introduced by isoelectronic substitution in the range of attraction-center concentrations below the threshold of percolation
along the sites of a disordered sublattice. To estimate the number of localized states we use the results of lattice percolation
theory. We describe a method for distinguishing, within the continuum percolation theory, among the various “radiating” states
of the fluctuation-induced tail, states that form the luminescence band at weak excitation. We also establish the position
of the band of radiating states in relation to the absorption band of the excitonic ground state and the mobility edge of
the system. The approach is used to describe the optical spectra of the solid solution ZnSe1−c
Tec, which at low Te concentrations can be interpreted as a system with strong scattering. We take into account the exciton-phonon
interaction and show that the calculated and observed luminescence spectra of localized excitons are in good agreement with
each other.
Zh. éksp. Teor. Fiz. 115, 1039–1062 (March 1999) |
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