Surface and bulklike phonon modes of Si(1Â 0Â 0) nanometer thin film

The surface and bulklike phonon modes of Si(1 0 0)c(4 × 2) nanometer-thin film were investigated using DFT calculations with a 4 × 4 supercell consisting of 10 layers. The characteristic peaks of surface and bulklike phonon spectra provide large spectral variation in the phonons of nano-thin films.