Coherent phenomena and interaction of excitons in wide ZnSe/Zn1?xMgxSe single quantum wells

Schätz, A., Wagner, H.P., Maier, R., Preis, H., Frey, T., Reisinger, T., Gebhardt, W., Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Hvam, J.M. 1998. Coherent phenomena and interaction of excitons in wide ZnSe/Zn1?xMgxSe single quantum wells. Journal of Crystal Growth 184 (18) , pp. 672-675. 10.1016/S0022-0248(98)80140-1

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Abstract

We investigate the transient four-wave mixing (FWM) response of wide ZnSe/Zn 1- xMg xSe single quantum wells in a two-beam self-diffraction configuration. The spectrally resolved FWM signals show excitonic transitions which are essentially homogeneously broadened, and show dephasing times between 1 and 2 ps at a lattice temperature of 10 K. Simultaneous excitation of several exciton states leads to pronounced quantum beats in the FWM signal. The formation of heavy-hole biexcitons with binding energies of E bXX = 3.5 ± 0.5 meV is identified by polarization-dependent measurements. These measurements also indicate that excitation-induced dephasing gives the main contribution to the FWM process.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	Elsevier
ISSN:	0022-0248
Last Modified:	28 Oct 2022 08:41
URI:	https://orca.cardiff.ac.uk/id/eprint/71763

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