Dephasing and interaction of excitons CdSe/ZnSe islands

H. P. Wagner, H.-P. Tranitz, H. Preis, Wolfgang Langbein, Jørn Märcher Hvam

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalJournal of Crystal Growth
Volume214-215
Pages (from-to)747-751
ISSN0022-0248
Publication statusPublished - 2000

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