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Proceedings Paper

Exciton-polariton resonances in light absorption spectra of semiconductor superlattices and crystals
Author(s): Ruben P. Seisyan; Vladimir A. Kosobukin; S. A. Vaganov; G. N. Aliev; O. S. Coschug
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Paper Abstract

The absorption-edge spectra have been studied in the temperature range from 4 to 300 K for single-crystal CdTe, ZnTe, GaAs wafers and GaAs/(Al,Ga)As multiple quantum well (MQW) structures. In all cases the frequency integrated absorption coefficient K is found to increase monotonously with temperature T up to T = T* and to keep constant above T*. The temperatures T*, depending on semiconducting materials, might be considered as critical ones corresponding to a change in polaritonic ener~ transport mechanism due to the lack of spatial dispersion at T<T*. It was shown, that though the measured temperatures T -. o2 K correspond to much larger linewidths than could be explained by using the theoretical value of the exciton damping parameter, this discrepancy can be overcome if a temperature-dependent inhomogeneous broadening is taken into account consistently. A similar temperature dependence of K with T* = 20 K has been observed for the first time in GaAs/( Al, Ga)As MQW-structures.

Paper Details

Date Published: 19 November 1993
PDF: 8 pages
Proc. SPIE 1985, Physical Concepts and Materials for Novel Optoelectronic Device Applications II, (19 November 1993);
Show Author Affiliations
Ruben P. Seisyan, A.F. Ioffe Physical-Technical Institute (Russia)
Vladimir A. Kosobukin, A.F. Ioffe Physical-Technical Institute (Russia)
S. A. Vaganov, A.F. Ioffe Physical-Technical Institute (Russia)
G. N. Aliev, A.F. Ioffe Physical-Technical Institute (Russia)
O. S. Coschug, A.F. Ioffe Physical-Technical Institute (Russia)

Published in SPIE Proceedings Vol. 1985:
Physical Concepts and Materials for Novel Optoelectronic Device Applications II
Fabio Beltram; Erich Gornik, Editor(s)

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