Low Frequency Raman Scattering from Acoustic Phonon Confined in $CdS_{1-x}Se_x$ Nanoparticles in Borosilicate Glass

Details Low Frequency Raman Scattering from Acoustic Phonon Confined in $CdS_{1-x}Se_x$ Nanoparticles in Borosilicate Glass Low Frequency Raman Scattering from Acoustic Phonon Confined in $CdS_{1-x}Se_x$ Nanoparticles in Borosilicate Glass

2008-03-07

arxiv.org/abs/0803.1049v1

Physics

Condensed Matter

Materials Science

18 pages

Scientific paper

Phonon modes found in low frequency Raman scattering from $CdS_{1-x}Se_x$ nanocrystals embedded in borosilicate glass arising from confined acoustic phonons are investigated. In addition to the breathing modes and quadrupolar modes, two additional modes are found in the spectra. In order to assign the new modes, confined acoustic phonon frequencies are calculated using CFM, CSM and the Lamb model. Based on the ratio of the frequencies of the new modes to those of the quadrupolar mode, the new modes are assigned to first overtone of the quadrupolar mode (l=2, n=1) and l=1, n=0 torsional mode. The appearance of the forbidden torsional mode is attributed to nonspherical appearance shape of the nanoparticle found from high-resolution TEM.

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