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Thermalization and Photoluminescence Kinetics of Statistically-Degenerate Indirect Excitons in GaAs/AlGaAs Coupled Quantum Wells

✍ Scribed by Soroko, A.V. ;Ivanov, A.L. ;Butov, L.V.

Publisher: John Wiley and Sons
Year: 2002
Tongue: English
Weight: 121 KB
Volume: 190
Category: Article
ISSN: 0031-8965
DOI: 10.1002/1521-396x(200204)190:3<719::aid-pssa719>3.0.co;2-3

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✦ Synopsis

In order to model the very recent experimental data on the relaxation kinetics and photoluminescence (PL) dynamics of indirect excitons in high-quality GaAs/AlGaAs coupled quantum wells (QWs) at extremely low bath temperatures T b ¼ 0:05 K, we analyze, both analytically and numerically, the relevant quantum Boltzmann equation. We show that at large delay times after initial optical excitation, thermalization of QW excitons occurs through the nonequilibrium states, weakly correlates with the initial conditions, and depends only upon the two control parameters, T b and the degeneracy temperature T 0 . We present a generic solution of the quantum Boltzmann equation and compare it with the numerical simulations. Finally, we report the experimental and theoretical study on the radiative lifetime t opt of quantum degenerate indirect excitons at low temperatures, 50 mK T b 2 K.

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