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Exciton dephasing and biexciton binding in CdSe/ZnSe islands

Wagner, H., Tranitz, H.-P., Preis, H., Langbein, Wolfgang Werner, Leosson, K. and Hvam, J. 1999. Exciton dephasing and biexciton binding in CdSe/ZnSe islands. Physical Review B 60 (15) , pp. 10640-10643. 10.1103/PhysRevB.60.10640

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The dephasing of excitons and the formation of biexcitons in self-organized CdSe/ZnSe islands grown by molecular-beam epitaxy is investigated using spectrally resolved four-wave mixing. A distribution of exciton-exciton scattering efficiencies and dephasing times in the range of 0.5–10 ps are observed. This indicates the presence of differently localized exciton states at comparable transition energies. Polarization-dependent measurements identify the formation of biexcitons with a biexciton binding energy of more than four times the bulk value. With decreasing exciton energy, the binding energy slightly increases from 21.5 to 23 meV, while its broadening decreases from 5.5 to 3 meV. This is attributed to a strong three-dimensional confinement with improving shape uniformity for decreasing exciton energy.

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: 04 Jun 2017 08:01

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