Polaron relaxation dynamics in InAs/GaAs self-assembled quantum dots

TitlePolaron relaxation dynamics in InAs/GaAs self-assembled quantum dots
Publication TypeJournal Article
Year of Publication2004
AuthorsE.A. Zibik, L.R. Wilson, R.P. Green, J.PR Wells, P.J Phillips, D.A Carder, J.W. Cockburn, M.S Skolnick, M.J Steer, H.Y Liu, M. Hopkinson
JournalPhysica E-Low-Dimensional Systems & Nanostructures
Date PublishedMar
Type of ArticleArticle
ISBN Number1386-9477
Accession NumberISI:000220873300053
KeywordsCONFINED OPTICAL PHONONS, EXCITATION, intersublevel transitions, LIFETIME, polaron effect, quantum dots, SCATTERING, SPECTROSCOPY, time-resolved

Polaron decay in n-type InAs quantum dots has been investigated using energy dependent, mid-infrared pump-probe spectroscopy. By studying samples with differing ground state to first excited state energy separations the relaxation time has been measured between similar to40 and 60 meV. The low-temperature decay time increases with increasing detuning between the pump energy and the optical phonon energy and is maximum (55 ps) at 56 meV. From the experimentally determined decay times we are able to extract a low-temperature optical phonon lifetime of 13 ps for InAs QDs. We find that the polaron decay time decreases by a factor of similar to2 at room temperature due to the reduction of the optical phonon lifetime. (C) 2003 Elsevier B.V. All rights reserved.

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Alternate TitlePhysica E

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