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 |
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 |
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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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