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Single-photon emitters and detectors are key devices for realizing secure communications by single-photon-based cryptography and single-photon-based quantum computing. For the establishment of these technologies, we need to understand the electronic structures of single and multiple excitons. Therefore, we have studied their emissions via the micro-photoluminescence (μ-PL) spectra of strain-free GaAs/AlGaAs...
We demonstrate self-assembly of GaAs double quantum dots (DQDs) by droplet epitaxy in a lattice-matched system in addition to concentric quantum double rings (CQDRs). The growth mechanism of these complex nanostructures is understood by taking into account the two crystallization processes; the counter-migration (of Ga and As atoms)-induced crystallization and droplet-edge-enhanced crystallization...
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