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Spin relaxation without coherence loss: Fine-structure splitting of localized excitons

Langbein, Wolfgang Werner ORCID:, Zimmermann, R., Runge, E. and Hvam, J. M. 2000. Spin relaxation without coherence loss: Fine-structure splitting of localized excitons. physica status solidi (b) 221 (1) , pp. 249-253. 10.1002/1521-3951(200009)221:1<349::AID-PSSB349>3.0.CO;2-A

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We investigate the polarization dynamics of the secondary emission from a disordered quantum well after resonant excitation. Using the speckle analysis technique we determine the coherence degree of the emission, and find that the polarization-relaxed emission has a coherence degree comparable to the one of the emission co-polarized to the excitation. This is explained by the fine-structure splitting between the two optically active states of anisotropically localized excitons. The eigenstates are linearly polarized with distributed orientations. The time evolution of the involved eigenstate doublets leads to a polarization dynamics and to a speckle intensity correlation between the orthogonal light polarizations. A model considering localized exciton states in an anisotropically Gaussian-correlated potential landscape gives a consistent description of the experimental observations. For a 4 nm GaAs quantum well, an anisotropy along the [1-10] direction with correlation lengths of 28 nm along and 17 nm perpendicular is deduced, leading to an average fine-structure splitting of 29 μeV.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Wiley
ISSN: 1521-3951
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Last Modified: 28 Oct 2022 08:40

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