Abstract
Bismuth nanocrystals, embedded in amorphous germanium thin films and synthesized by pulsed-laser deposition, are investigated by Raman spectroscopy. Raman spectra are strongly dependent upon the size of the deposited nanocrystals. For the larger nanocrystals, two peaks corresponding to the optical phonons ${A}_{1g}$ and ${E}_{g}$ can be observed. As the size of the particles decreases, the ${E}_{g}$ mode shifts to higher frequencies while the ${A}_{1g}$ mode shifts to lower frequencies. Such behavior is a result of the curvature of the respective phonon-dispersion curves in Bi. A third size-dependent low-frequency mode has also been observed and attributed to acoustic phonons confined in Bi nanocrystals.
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