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Dephasing and interaction of excitons in CdSe/ZnSe islands

Wagner, H. P., Tranitz, H. -P., Preis, H., Langbein, Wolfgang Werner and Hvam, J.M. 2000. Dephasing and interaction of excitons in CdSe/ZnSe islands. Journal of Crystal Growth 214 (21) , pp. 747-751. 10.1016/S0022-0248(00)00192-5

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The dephasing of excitons in self-organized CdSe/ZnSe islands grown by molecular-beam epitaxy is investigated using spectrally resolved four-wave mixing. A distribution of dephasing times is observed, indicating the existence of localized excitons with different relaxation times at comparable transition energies. Polarization-dependent measurements identify the formation of biexcitons. The observed large biexciton binding energy of 22meV increases with decreasing exciton energy, which is attributed to an increasing three-dimensional confinement.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Elsevier
ISSN: 0022-0248
Last Modified: 04 Jun 2017 08:00

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