ISSN:
1090-6487
Keywords:
73.61.Ey
;
71.35.Cc
;
78.66.Fd
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The influence of photoexcited carriers on the dynamics of the absorption spectra of GaAs/AlxGa1−2x As multilayer quantum wells is investigated experimentally. It is found that at quasiparticle densities all the way up to 1011 cm−2 the saturation of the excitonic absorption is due to both a decrease of oscillator strength and broadening of the excitonic lines. It is shown that in the case of femtosecond resonance laser exci-tation the decrease of oscillator strength is due to free electron-hole pairs, while the broadening and energy shift of the excitonic lines are due to the exciton-exciton interaction. The lifetimes of free electron-hole pairs and excitons (≈65 ps and ≈410 ps, respectively) are determined from the exponential decrease of the change in the oscillator strength and in the width and energy position of the excitonic lines.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1134/1.567493
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