ArticleNanomaterials (Basel, Switzerland)2020
Exciton Dynamics in Droplet Epitaxial Quantum Dots Grown on (311)A-Oriented Substrates.
Article in Nanomaterials (Basel, Switzerland), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed, 7 citations in OpenAlex.
- Temperature-Enhanced Exciton Emission from GaAs Cone-Shell Quantum Dots.Nanomaterials (Basel, Switzerland) · 2023Article
- Modeling of Al and Ga Droplet Nucleation during Droplet Epitaxy or Droplet Etching.Nanomaterials (Basel, Switzerland) · 2021Article
- Polarization Anisotropies in Strain-Free, Asymmetric, and Symmetric Quantum Dots Grown by Droplet Epitaxy.Nanomaterials (Basel, Switzerland) · 2021Article
- Atomic-Scale Characterization of Droplet Epitaxy Quantum Dots.Nanomaterials (Basel, Switzerland) · 2021Review
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Authors and funding
4 authors at 2 institutions in 2 countries.
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Abstract
Droplet epitaxy allows the efficient fabrication of a plethora of 3D, III-V-based nanostructures on different crystalline orientations. Quantum dots grown on a (311)A-oriented surface are obtained with record surface density, with or without a wetting layer. These are appealing features for quantum dot lasing, thanks to the large density of quantum emitters and a truly 3D lateral confinement. However, the intimate photophysics of this class of nanostructures has not yet been investigated. Here, we address the main optical and electronic properties of s-shell excitons in individual quantum dots grown on (311)A substrates with photoluminescence spectroscopy experiments. We show the presence of neutral exciton and biexciton as well as positive and negative charged excitons. We investigate the origins of spectral broadening, identifying them in spectral diffusion at low temperature and phonon interaction at higher temperature, the presence of fine interactions between electron and hole spin, and a relevant heavy-hole/light-hole mixing. We interpret the level filling with a simple Poissonian model reproducing the power excitation dependence of the s-shell excitons. These results are relevant for the further improvement of this class of quantum emitters and their exploitation as single-photon sources for low-density samples as well as for efficient lasers for high-density samples.
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