Neutral and charged biexciton-exciton cascade in near-telecom-wavelength quantum dots
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 94, no 4, 045303Article in journal (Refereed) PublishedText
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
IdentifiersURN: urn:nbn:se:kth:diva-190490DOI: 10.1103/PhysRevB.94.045303ISI: 000379719700003ScopusID: 2-s2.0-84978500151OAI: oai:DiVA.org:kth-190490DiVA: diva2:954054
QC 201608192016-08-192016-08-122016-08-19Bibliographically approved