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Thermalization of free excitons in ZnSe quantum wells

Kalt, H., Umlauff, M., Hoffmann, J., Langbein, Wolfgang Werner, Hvam, J. M., Scholl, M., Söllner, J., Heuken, M., Jobst, B. and Hommel, D. 1998. Thermalization of free excitons in ZnSe quantum wells. Journal of Crystal Growth 184-18 , pp. 795-800. 10.1016/S0022-0248(98)80165-6

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The thermalization dynamics of hot free excitons in ZnSe quantum wells is studied by photoluminescence excitation (PLE), steady-state (cw-PL) and time-resolved photoluminescence (TRPL). Formation of excitons by emission of LO phonons is very efficient and leads to the generation of narrow hot-exciton distributions. The LO phonon-assisted recombination of the excitons is a direct monitor of the hot-exciton dynamics. A thermalized exciton distribution is reached only after some 100 ps due to the slow exciton relaxation assisted by acoustic phonons. The hot-exciton features in PLE, cw-PL and TRPL are consistently reproduced by explicitly calculating the relevant scattering processes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Hot excitons; ZnSe quantum wells;Photoluminescence excitation; Time-resolved luminescence; Exciton-phonon coupling; Thermalization
Publisher: Elsevier
ISSN: 0022-0248
Last Modified: 04 Jun 2017 08:02

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