We present a detailed experimental study of the line broadening of the different excitonic complexes inside single GaAs/AlGaAs quantum dots. The investigated nanostructures are self assembled quantum dots (QDs), strain free nanocrystals grown by Modified Droplet Epitaxy technique. They show a typical PL spectrum with a triplet structure and by time correlated spectroscopy each contribution can be unambiguously assigned to neutral exciton, biexciton and trion. By high resolution spectroscopy, we have studied the line broadening for several single GaAs/AlGaAs QDs. The measured linewidth is found to vary between several tens to few hundreds of mu eV and we attribute this to spectral diffusion. The striking feature of the PL spectrum is that the trion and the biexciton line are always sharper with respect to the neutral exciton.

Line broadening of excitonic complexes in self-assembled GaAs/AlGaAs single quantum dots / M. Abbarchi; C. Mastrandrea; T. Kuroda; A. Vinattieri; T. Mano; N. Koguchi; K. Sakoda; M. Gurioli. - In: PHYSICA STATUS SOLIDI. C, CURRENT TOPICS IN SOLID STATE PHYSICS. - ISSN 1862-6351. - STAMPA. - 6:(2009), pp. 886-889. [10.1002/pssc.200880653]

Line broadening of excitonic complexes in self-assembled GaAs/AlGaAs single quantum dots

ABBARCHI, MARCO
Membro del Collaboration Group
;
VINATTIERI, ANNA
Membro del Collaboration Group
;
GURIOLI, MASSIMO
Membro del Collaboration Group
2009

Abstract

We present a detailed experimental study of the line broadening of the different excitonic complexes inside single GaAs/AlGaAs quantum dots. The investigated nanostructures are self assembled quantum dots (QDs), strain free nanocrystals grown by Modified Droplet Epitaxy technique. They show a typical PL spectrum with a triplet structure and by time correlated spectroscopy each contribution can be unambiguously assigned to neutral exciton, biexciton and trion. By high resolution spectroscopy, we have studied the line broadening for several single GaAs/AlGaAs QDs. The measured linewidth is found to vary between several tens to few hundreds of mu eV and we attribute this to spectral diffusion. The striking feature of the PL spectrum is that the trion and the biexciton line are always sharper with respect to the neutral exciton.
2009
6
886
889
M. Abbarchi; C. Mastrandrea; T. Kuroda; A. Vinattieri; T. Mano; N. Koguchi; K. Sakoda; M. Gurioli
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/359387
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