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Bragas, A.V.; Aku-Leh, C.; Costantino, S.; Ingale, A.; Zhao, J.; Merlin, R. "Ultrafast optical generation of coherent phonons in CdTe 1-xSex quantum dots" (2004) Physical Review B - Condensed Matter and Materials Physics. 69(20):205306-1-205306-11
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Abstract:

We report on the impulsive generation of coherent optical phonons in CdTe0.68Se0.32 nanocrystallites embedded in a glass matrix. Pump-probe experiments using femtosecond laser pulses were performed by tuning the laser central energy to resonate with the absorption edge of the nanocrystals. We identify two longitudinal optical phonons, one longitudinal acoustic phonon and a fourth mode of a mixed longitudinal-transverse nature. The amplitude of the optical phonons as a function of the laser central energy exhibits a resonance that is well described by a model based on impulsive stimulated Raman scattering. The phases of the coherent phonons reveal coupling between different modes. At low power density excitations, the frequency of the optical coherent phonons deviates from values obtained from spontaneous Raman scattering. This behavior is ascribed to the presence of electronic impurity states which modify the nanocrystal dielectric function and, thereby, the frequency of the infrared-active phonons.

Registro:

Documento: Artículo
Título:Ultrafast optical generation of coherent phonons in CdTe 1-xSex quantum dots
Autor:Bragas, A.V.; Aku-Leh, C.; Costantino, S.; Ingale, A.; Zhao, J.; Merlin, R.
Filiación:Harrison M. Randall Lab. of Physics, University of Michigan, Ann Arbor, MI 48109-1120, United States
Departamento de Física, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Laser Physics Division, Centre for Advanced Technology, Indore 452013, India
Physics Department, Mcgill University, Montreal, Que. H3A 2T, Canada
Palabras clave:cadmium derivative; glass; selenium derivative; tellurium derivative; article; crystal; density; dielectric constant; electronics; energy absorption; infrared radiation; laser; nanoparticle; optics; phonon; quantum mechanics; Raman spectrometry
Año:2004
Volumen:69
Número:20
Página de inicio:205306
Página de fin:1-205306-11
DOI: http://dx.doi.org/10.1103/PhysRevB.69.205306
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:01631829
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v69_n20_p205306_Bragas

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Citas:

---------- APA ----------
Bragas, A.V., Aku-Leh, C., Costantino, S., Ingale, A., Zhao, J. & Merlin, R. (2004) . Ultrafast optical generation of coherent phonons in CdTe 1-xSex quantum dots. Physical Review B - Condensed Matter and Materials Physics, 69(20), 205306-1-205306-11.
http://dx.doi.org/10.1103/PhysRevB.69.205306
---------- CHICAGO ----------
Bragas, A.V., Aku-Leh, C., Costantino, S., Ingale, A., Zhao, J., Merlin, R. "Ultrafast optical generation of coherent phonons in CdTe 1-xSex quantum dots" . Physical Review B - Condensed Matter and Materials Physics 69, no. 20 (2004) : 205306-1-205306-11.
http://dx.doi.org/10.1103/PhysRevB.69.205306
---------- MLA ----------
Bragas, A.V., Aku-Leh, C., Costantino, S., Ingale, A., Zhao, J., Merlin, R. "Ultrafast optical generation of coherent phonons in CdTe 1-xSex quantum dots" . Physical Review B - Condensed Matter and Materials Physics, vol. 69, no. 20, 2004, pp. 205306-1-205306-11.
http://dx.doi.org/10.1103/PhysRevB.69.205306
---------- VANCOUVER ----------
Bragas, A.V., Aku-Leh, C., Costantino, S., Ingale, A., Zhao, J., Merlin, R. Ultrafast optical generation of coherent phonons in CdTe 1-xSex quantum dots. Phys. Rev. B Condens. Matter Mater. Phys. 2004;69(20):205306-1-205306-11.
http://dx.doi.org/10.1103/PhysRevB.69.205306