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Neutral and charged biexciton-exciton cascade in near-telecom-wavelength quantum dots
KTH, School of Engineering Sciences (SCI), Applied Physics. Univ Stuttgart, Germany.
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2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 94, no 4, 045303Article in journal (Refereed) PublishedText
Abstract [en]

We investigate the cascaded emission of photons from low-density InGaAs/GaAs quantum dots grown by metal-organic vapor-phase epitaxy that are intentionally redshifted toward telecommunication wavelengths. We observe multiple radiative cascades within a single quantum dot and attribute these to neutral and charged excited configurations. The corresponding transitions are identified by combining microphotoluminescence and photon correlation measurements. Full-configuration interaction calculations further support the identification of the emission lines and provide additional information about the confinement of electron and hole wave functions. We apply a Monte Carlo simulation to estimate the effective spin scattering rates between excited triplet and singlet ground states of the negatively charged trion. These spin-flip processes directly affect the observed radiative cascade.

Place, publisher, year, edition, pages
2016. Vol. 94, no 4, 045303
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Physical Sciences
URN: urn:nbn:se:kth:diva-190490DOI: 10.1103/PhysRevB.94.045303ISI: 000379719700003ScopusID: 2-s2.0-84978500151OAI: diva2:954054

QC 20160819

Available from: 2016-08-19 Created: 2016-08-12 Last updated: 2016-08-19Bibliographically approved

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Zeuner, Katharina
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