Dynamics of charge-transfer excitons in type-II semiconductor heterostructures

The formation, decay, and coherence properties of charge-transfer excitons in semiconductor heterostructures are investigated by applying four-wave-mixing and terahertz spectroscopy in combination with a predictive microscopic theory. A charge-transfer process is identified where the optically induc...

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Bibliographic Details
Published in:Physical review. B 2018-03, Vol.97 (12), Article 125306
Main Authors: Stein, M., Lammers, C., Richter, P.-H., Fuchs, C., Stolz, W., Koch, M., Vänskä, O., Weseloh, M. J., Kira, M., Koch, S. W.
Format: Article
Language:English
Subjects:
Charge transfer
Decay
Excitons
Four-wave mixing
Heterostructures
Holes (electron deficiencies)
Substructures
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Summary:The formation, decay, and coherence properties of charge-transfer excitons in semiconductor heterostructures are investigated by applying four-wave-mixing and terahertz spectroscopy in combination with a predictive microscopic theory. A charge-transfer process is identified where the optically induced coherences decay directly into a charge-transfer electron-hole plasma and exciton states. It is shown that charge-transfer excitons are more sensitive to the fermionic electron-hole substructure than regular excitons.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.125306