Spin Repolarization Due to Pauli Blocking in Quantum Dots

We have studied the spin dynamics in self‐organized InAs/GaAs quantum dots (QD) by time‐resolved photoluminescence (PL). After optical orientation of carriers photogenerated in the GaAs barrier by 1.2 ps light pulses, an unexpected increase of the QD excited‐state luminescence polarization is observ...

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Published inphysica status solidi (b) Vol. 221; no. 1; pp. 71 - 75
Main Authors Paillard, M., Marie, X., Renucci, P., Amand, T., Kalevich, V.K., Kavokin, K.V., Ustinov, V.M.
Format Journal Article
LanguageEnglish
Published Berlin WILEY-VCH Verlag Berlin GmbH 01.09.2000
WILEY‐VCH Verlag Berlin GmbH
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Summary:We have studied the spin dynamics in self‐organized InAs/GaAs quantum dots (QD) by time‐resolved photoluminescence (PL). After optical orientation of carriers photogenerated in the GaAs barrier by 1.2 ps light pulses, an unexpected increase of the QD excited‐state luminescence polarization is observed. This effect is interpreted in terms of Pauli blocking which prevents the relaxation of electrons in the QD ground state already occupied by another electron with the same spin orientation. A theoretical model qualitatively describing the experimental results is developed.
Bibliography:ArticleID:PSSB71
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ISSN:0370-1972
1521-3951
DOI:10.1002/1521-3951(200009)221:1<71::AID-PSSB71>3.0.CO;2-K