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

Wagner, H.P., Schätz, A., Maier, R., Langbein, Wolfgang Werner 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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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: 04 Jun 2017 08:02

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