Interaction-induced dephasing of excitons in wide ZnSe/ZnMgSe single quantum wells

Wagner, H.P., Schätz, A., Maier, R., Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Hvam, J.M. 1998. Interaction-induced dephasing of excitons in wide ZnSe/ZnMgSe single quantum wells. Physica E: Low-dimensional Systems and Nanostructures 2 (1-4) , pp. 82-86. 10.1016/S1386-9477(98)00019-8

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Abstract

The dephasing of excitons in wide ZnSe/Zn0.94Mg0.06Se single quantum wells (SQW) is investigated by spectrally resolved, time integrated four-wave mixing (FWM). Simultaneous excitation of 1s center-of-mass quantized heavy-hole and light-hole excition states leads to pronounced quantum beats. Polarization-dependent measurements identify a biexcition formation of the 11h exciton showing a binding energy of EBX=3.5±0.5 meV. The measurements also indicate, that the third-order polarization is strongly influenced by interaction-induced processes. We show, that excitation-induced dephasing gives the main contribution for co-polarized excitation, followed by the conventional density grating mechanism, while local fields play a subordinate role.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	Elsevier
ISSN:	1386-9477
Last Modified:	28 Oct 2022 08:43
URI:	https://orca.cardiff.ac.uk/id/eprint/71840

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