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Exciton lifetime and spin dynamics in type-I In1-xAlxAs/Ga0.67Al0.33As quantum dots: Photoluminescence and pump-probe experiments

Abstract : The exciton lifetime and spin relaxation have been studied in self-assembled In1-xAlxAs/Ga0.67Al0.33As quantum dots (QDs). Time-resolved photoluminescence and resonant pump-probe measurements were performed, at variable temperature and for different QD aluminium compositions. At low temperature, a long exciton-spin relaxation time has been measured, in agreement with the QD zero-dimensional confinement and the quenching of the relaxation mechanisms. The existence of a quasi-2D regime, in sample with a high QD density, has been observed. The importance of thermally-activated processes toward excited states is also evidenced, for QDs with different compositions and sizes. (C) 2014 Elsevier B.V. All rights reserved.
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https://hal.archives-ouvertes.fr/hal-01229134
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Submitted on : Monday, November 16, 2015 - 1:38:41 PM
Last modification on : Friday, January 14, 2022 - 9:36:06 AM

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A. Ben Daly, Frédéric Bernardot, Thierry Barisien, E. Galopin, A. Lermaitre, et al.. Exciton lifetime and spin dynamics in type-I In1-xAlxAs/Ga0.67Al0.33As quantum dots: Photoluminescence and pump-probe experiments. Journal of Luminescence, Elsevier, 2015, 158, pp.136-141. ⟨10.1016/j.jlumin.2014.09.035⟩. ⟨hal-01229134⟩

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