Dark exciton decay dynamics of a semiconductor quantum dot

Paul A. Dalgarno, Jason M. Smith, Brian D. Gerardot, Alexander O. Govorov, Khaled Karrai, Pierre M. Petroff, Richard J. Warburton

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We report measurements of the exciton decay dynamics of a single self-assembled quantum dot following non-resonant excitation. The singly charged exciton, the trion, exhibits a simple one component exponential decay corresponding to radiative recombination. Conversely, the neutral exciton exhibits a two component exponential decay. We argue that the secondary component arises from dark exciton creation and subsequent conversion to a bright exciton through a spin flip. The spin flip time is a strong function of the bias applied between a Fermi reservoir close to the dot and a Schottky gate electrode as a result of a Kondo-like spin swap process. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA,.

Original languageEnglish
Pages (from-to)2591-2597
Number of pages7
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume202
Issue number14
DOIs
Publication statusPublished - Nov 2005

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