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Abstract:

Acousticlike vibrations were observed in spontaneous Raman measurements on Cd Te0.68 Se0.32 quantum dots embedded in a borosilicate matrix and ascribed to the l=0, l=2, and l=1 modes of a spherical particle. Pump-probe stimulated Raman measurements on the same sample reveal only the symmetric l=0 mode, the frequency of which increases as the laser central energy moves to higher energies. Consistent with the strong dependence of the exciton energy on the particle size, such a behavior is attributed to resonant size-selective excitation of nanocrystallites whose absorption edge coincides with the central energy of the optical pulses. This selectivity, relying on the existence of double-resonant terms in the generation process, is not observed in spontaneous Raman scattering for which the resonances involve a single term. © 2006 The American Physical Society.

Registro:

Documento: Artículo
Título:Raman and ultrafast optical spectroscopy of acoustic phonons in Cd Te0.68 Se0.32 quantum dots
Autor:Bragas, A.V.; Aku-Leh, C.; Merlin, R.
Filiación:Departamento de Física, FCEyN, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
FOCUS Center, Department of Physics, University of Michigan, Ann Arbor, MI 48109-1040, United States
Institut des Nanosciences de Paris, UMR 7588, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France
Department of Physics, King's College London, Strand, London WC2R 2LS, United Kingdom
Año:2006
Volumen:73
Número:12
DOI: http://dx.doi.org/10.1103/PhysRevB.73.125305
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:10980121
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v73_n12_p_Bragas

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Citas:

---------- APA ----------
Bragas, A.V., Aku-Leh, C. & Merlin, R. (2006) . Raman and ultrafast optical spectroscopy of acoustic phonons in Cd Te0.68 Se0.32 quantum dots. Physical Review B - Condensed Matter and Materials Physics, 73(12).
http://dx.doi.org/10.1103/PhysRevB.73.125305
---------- CHICAGO ----------
Bragas, A.V., Aku-Leh, C., Merlin, R. "Raman and ultrafast optical spectroscopy of acoustic phonons in Cd Te0.68 Se0.32 quantum dots" . Physical Review B - Condensed Matter and Materials Physics 73, no. 12 (2006).
http://dx.doi.org/10.1103/PhysRevB.73.125305
---------- MLA ----------
Bragas, A.V., Aku-Leh, C., Merlin, R. "Raman and ultrafast optical spectroscopy of acoustic phonons in Cd Te0.68 Se0.32 quantum dots" . Physical Review B - Condensed Matter and Materials Physics, vol. 73, no. 12, 2006.
http://dx.doi.org/10.1103/PhysRevB.73.125305
---------- VANCOUVER ----------
Bragas, A.V., Aku-Leh, C., Merlin, R. Raman and ultrafast optical spectroscopy of acoustic phonons in Cd Te0.68 Se0.32 quantum dots. Phys. Rev. B Condens. Matter Mater. Phys. 2006;73(12).
http://dx.doi.org/10.1103/PhysRevB.73.125305