Low-frequency Raman scattering from Si/Ge nanocrystals in different matrixes caused by acoustic phonon quantization

  title={Low-frequency Raman scattering from Si/Ge nanocrystals in different matrixes caused by acoustic phonon quantization},
  author={Venu Mankad and Sanjeev K. Gupta and Prafulla K. Jha and N. N. Ovsyuk and G. A. Kachurin},
  journal={Journal of Applied Physics},
Si and Ge nanocrystals (nc-Si and nc-Ge) with average sizes in the range of 6 and 6.3 nm, embedded in SiO2/GeO2 matrix, were fabricated and their acoustic-phonon vibrational properties were investigated using two different approaches by considering the elastic continuum model and fixed boundary condition. The breathing and quadrupolar modes are found in the spectra. The presence of medium significantly affects the phonon peaks and results into the broadening of the modes which is more in the… 
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