Thermalization of free excitons in ZnSe quantum wells

Kalt, H., Umlauff, M., Hoffmann, J., Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023, 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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Abstract

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:	28 Oct 2022 08:46
URI:	https://orca.cardiff.ac.uk/id/eprint/72110

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