Carrier transfer in vertically stacked quantum ring-quantum dot chains
| Autor: | Georgiy G. Tarasov, Gregory J. Salamo, L. D. de Souza, Z. M. Wang, Marcio D. Teodoro, Victor Lopez-Richard, Jiang Wu, Yu. I. Mazur, Mourad Benamara, Vitaliy G. Dorogan, V. Lopes-Oliveira, G. E. Marques, Euclydes Marega |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Photoluminescence Condensed matter physics business.industry Superlattice General Physics and Astronomy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Gallium arsenide Condensed Matter::Materials Science chemistry.chemical_compound chemistry Quantum dot POÇOS QUÂNTICOS Optoelectronics Charge carrier business Lasing threshold Quantum Molecular beam epitaxy |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | The interplay between structural properties and charge transfer in self-assembled quantum ring (QR) chains grown by molecular beam epitaxy on top of an InGaAs/GaAs quantum dot (QD) superlattice template is analyzed and characterized. The QDs and QRs are vertically stacked and laterally coupled as well as aligned within each layer due to the strain field distributions that governs the ordering. The strong interdot coupling influences the carrier transfer both along as well as between chains in the ring layer and dot template structures. A qualitative contrast between different dynamic models has been developed. By combining temperature and excitation intensity effects, the tuning of the photoluminescence gain for either the QR or the QD mode is attained. The information obtained here about relaxation parameters, energy scheme, interlayer and interdot coupling resulting in creation of 1D structures is very important for the usage of such specific QR–QD systems for applied purposes such as lasing, detection, and energy-harvesting technology of future solar panels. |
| Databáze: | OpenAIRE |
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