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Observation of Distinct Two-Photon Transition Channels in CdTe Quantum Dots in a Regime of Very Strong Confinement

Gonçalves Vivas, Marcelo ; Leandro De Sousa, José Carlos ; De Boni, Leonardo ; Schiavon, Marco Antônio ; Mendonca, Cleber Renato

Materials, 2017-03, Vol.10 (4), p.363 [Periódico revisado por pares]

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Título:
Observation of Distinct Two-Photon Transition Channels in CdTe Quantum Dots in a Regime of Very Strong Confinement
Autor: Gonçalves Vivas, Marcelo ; Leandro De Sousa, José Carlos ; De Boni, Leonardo ; Schiavon, Marco Antônio ; Mendonca, Cleber Renato
Assuntos: 2PA transition channels ; CdTe quantum dots ; femtosecond two-photon spectroscopy
É parte de: Materials, 2017-03, Vol.10 (4), p.363
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: We report here on the direct observation of distinct two-photon transition channels in glutathione-capped (GSH) CdTe quantum dots (QDs) in a very strong confinement regime. CdTe-GSH QDs with different average diameters (2.5, 3.0, and 3.3 nm) were synthesized through the one-pot method and their two-photon absorption (2PA) spectrum determined by a femtosecond wavelength-tunable Z-scan. Our results show that the two lower-energy one-photon-allowed excitonic transitions, 1S (h) → 1S(e) and 2S (h) → 1S(e), are also accessed via 2PA. These results were ascribed to the relaxation of the parity selection rules due to the noncentrosymmetric structure of the CdTe QDs (zinc-blended structure), whose magnitude are determined by surface defects and structural irregularities present in CdTe-GSH QDs, in the strong confinement regime.
Editor: Switzerland: MDPI
Idioma: Inglês

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