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Type: Artigo de periódico
Title: Pressure Raman scattering of CdTe quantum dots
Author: Freire, PTC
Silva, MAA
Reynoso, VCS
Vaz, AR
Lemos, V
Abstract: A series of zinc-blende CdTe quantum dots in glass was investigated using Raman scattering and luminescence. The dot size was controlled by varying the annealing conditions. Luminescence was employed as a probe for quality of the sample and its adequacy for resonance. Resonant Raman spectra at the lowest confined energy levels of the quantum dots were obtained in function of the pressure in the range 1 bar to 4.6 GPa. The upper limit was established by a phase transition probably to NaCl structure, simultaneous with disappearance of Raman signal. In the latter phase, first-order Raman scattering is forbidden. The Gruneisen parameter for the LO phonon of CdTe quantum dots is given.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.55.6743
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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