%0 Journal Article
%T Exciton dynamics in CdTe/CdZnTe quantum well
%+ Saint Petersburg State University (SPBU)
%+ Laboratoire Charles Coulomb (L2C)
%+ Nanophysique et Semiconducteurs (NEEL - NPSC)
%A Mikhailov, A. V.
%A Kurdyubov, A. S.
%A Khramtsov, E. S.
%A Ignatiev, I. V.
%A Gribakin, B. F.
%A Cronenberger, S.
%A Scalbert, D.
%A Vladimirova, M.
%A André, Régis
%Z The authors acknowledge financial support fromSPbU, grants No. 94030557 and No. 94271404, andgrant ANR-21-CE30-0049 from French National Re-search Agency. I. V. I. thanks the Russian Science Foun-dation for the support of the theoretical part of the work(grant No. 19-72-20039). B. F. G. acknowledges supportof the French Embassy in Moscow (Vernadskii fellowshipfor young researchers 2021). R.A. acknowledge supportfrom the “NanoPhysics and SemiConductor” team
%Z 8 pages, 3 figures
%< avec comité de lecture
%@ 1063-7826
%J Fizika i tekhnika poluprovodnicov / Semiconductors
%I MAIK Nauka/Interperiodica
%N 7
%P 586
%8 2023-04-14
%D 2023
%Z 2304.07135
%K excitons
%K quantum wells
%K CdTe/CdZnTe
%K dynamics of exciton resonances
%Z Physics [physics]Journal articles
%X 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 Schrodinger equation. The dynamics of 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 bright excitons' states. The dynamics of the pump-induced nonradiative broadening observed experimentally is characterized 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 nanoseconds (iii). Possible mechanisms of the reservoir population and depletion responsible for this behavior are discussed.
%G English
%2 https://hal.science/hal-04251349v2/document
%2 https://hal.science/hal-04251349v2/file/Mikhailov_al_Semiconductors_2023.pdf
%L hal-04251349
%U https://hal.science/hal-04251349
%~ UGA
%~ CNRS
%~ INPG
%~ NEEL
%~ L2C
%~ NEEL-NPSC
%~ UNIV-MONTPELLIER
%~ UGA-EPE
%~ ANR
%~ UM-2015-2021
%~ UM-EPE