Thermodynamic origin of the slow free exciton photoluminescence rise in GaAs

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Beck, M. et al.: Thermodynamic origin of the slow free exciton photoluminescence rise in GaAs. In: Physical Reviews B 93 (2016), 081204. DOI: https://doi.org/10.1103/PhysRevB.93.081204

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Sum total of downloads: 146




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Abstract: 
We use time-resolved photoluminescence (TRPL) spectroscopy to unequivocally clarify the microscopic origin of the nanosecond free exciton photoluminescence rise in GaAs at low temperatures. In crucial distinction from previous work, we examine the TRPL of the GaAs free exciton second LO-phonon replica. This enables us to simultaneously monitor the unambiguous time evolution of the total exciton population and the cooling dynamics of the initially hot free exciton ensemble. We demonstrate by a model based on the Saha equation and the experimentally determined cooling behavior that the long-debated slow photoluminescence rise is caused by time-dependent shifts in the thermodynamic quasiequilibrium between free excitons and the uncorrelated electron-hole plasma.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 90 61.64%
2 image of flag of United States United States 18 12.33%
3 image of flag of China China 13 8.90%
4 image of flag of France France 4 2.74%
5 image of flag of Europe Europe 4 2.74%
6 image of flag of Russian Federation Russian Federation 2 1.37%
7 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 2 1.37%
8 image of flag of Ireland Ireland 2 1.37%
9 image of flag of Switzerland Switzerland 2 1.37%
10 image of flag of Australia Australia 2 1.37%
    other countries 7 4.79%

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