Spatially direct and indirect optical transitions observed for AlInAs/AlGaAs quantum dots
| Autor: | M.A. Maaref, R. Neffati, F. Bernardot, K. Boujdaria, Aristide Lemaître, S. Ben Radhia, Christophe Testelin, A. Ben Daly, I. Saïdi |
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| Přispěvatelé: | Université de Carthage - University of Carthage, Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de photonique et de nanostructures (LPN), Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Photonique et cohérence de spin (INSP-E12), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2016 |
| Předmět: |
[PHYS]Physics [physics]
010302 applied physics Photoluminescence Materials science Pl spectra chemistry.chemical_element 02 engineering and technology Electron 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences chemistry Aluminium Quantum dot 0103 physical sciences General Materials Science Electrical and Electronic Engineering Atomic physics 0210 nano-technology Ground state ComputingMilieux_MISCELLANEOUS Excitation Power density |
| Zdroj: | Superlattices and Microstructures Superlattices and Microstructures, 2016, 97, pp.529-535. ⟨10.1016/j.spmi.2016.07.030⟩ Superlattices and Microstructures, Elsevier, 2016, 97, pp.529-535. ⟨10.1016/j.spmi.2016.07.030⟩ |
| ISSN: | 0749-6036 1096-3677 |
| DOI: | 10.1016/j.spmi.2016.07.030 |
| Popis: | The effects of the Aluminium concentration on the emission of Al 0.45 In 0.55 As/Al y Ga 1− y As quantum dots (QDs) are investigated by photoluminescence (PL), with the excitation power density as a variable parameter. The influence of a varying barrier composition on the QD emission is investigated theoretically and discussed with respect to PL measurements. For the highest barrier composition value ( y = 0.77), we interpret the QD emission as originating from indirect type-II transitions involving electrons in the barrier X valley and heavy holes (HH), with S and P symmetry, in Al 0.45 In 0.55 As QDs. The PL spectra of the y = 0.38 sample exhibits three lines: two of them are related to indirect type-II transitions, in which the electron ground state belongs to the indirect gap (L and X) minima in the barrier conduction band, whereas the third transition is attributed to a direct type-I transitions. |
| Databáze: | OpenAIRE |
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