Direct observation of free-exciton thermalization in quantum-well structures

Umlauff, M., Hoffmann, J., Kalt, H., Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023, Hvam, J., Scholl, M., Söllner, J., Heuken, M., Jobst, B. and Hommel, D. 1998. Direct observation of free-exciton thermalization in quantum-well structures. Physical Review B 57 (3) , pp. 1390-1393. 10.1103/PhysRevB.57.1390

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Abstract

We report on a direct observation of free-exciton thermalization in quantum-well structures. A narrow energy distribution of free 1s excitons is created in ZnSe-based quantum wells by emission of one LO phonon after optical excitation of the continuum states with picosecond laser pulses. The subsequent relaxation dynamics within the 1s-exciton dispersion is directly monitored by time-resolved studies of the phonon-assisted photoluminescence. It is demonstrated that the free-exciton distribution remains nonthermal for some 100 ps. The observed dynamics is in reasonable agreement with numerical results of a rate-equation model which accounts for the relevant exciton-phonon coupling mechanisms.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	0163-1829
Last Modified:	28 Oct 2022 08:41
URI:	https://orca.cardiff.ac.uk/id/eprint/71767

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