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Pré-Publication, Document De Travail Année : 2023

Exciton dynamics in CdTe/CdZnTe quantum well

Résumé

Exciton energy structure and population dynamics in a wide CdTe/CdZnTe quantum well are studied by spectrally-resolved pump-probe spectroscopy. Multiple excitonic resonances in reflectance spectra are observed and identified by solving numerically three-dimensional Schr\"odinger equation. The pump-probe reflectivity signal is shown to be dominated by the photoinduced nonradiative broadening of the excitonic resonances, while pump-induced exciton energy shift and reduction of the oscillator strength appear to be negligible. This broadening is induced by the reservoir of dark excitons with large in-plane wave vector, which are coupled to the the bright excitons states. The dynamics of the pump-induced nonradiative broadening observed experimentally is characterised by three components: signal build up on the scale of tens of picoseconds (i) and bi-exponential decay on the scale of one nanosecond (ii) and ten nanosecons (iii). Possible mechanisms of the reservoir population and depletion responsible for this behaviour are discussed.
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Dates et versions

hal-04251349 , version 1 (20-10-2023)
hal-04251349 , version 2 (02-04-2024)

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A. V. Mikhailov, A. S. Kurdyubov, E. S. Khramtsov, I. V. Ignatiev, B. F. Gribakin, et al.. Exciton dynamics in CdTe/CdZnTe quantum well. 2023. ⟨hal-04251349v1⟩
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