Lattice Vibrational Modes and their Frequency Shifts in Semiconductor Nanowires

Details Lattice Vibrational Modes and their Frequency Shifts in Semiconductor Nanowires Lattice Vibrational Modes and their Frequency Shifts in Semiconductor Nanowires

2011-08-28

arxiv.org/abs/1108.5510v1

Nano Lett., 2011, 11 (7), pp 2618-2621

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 5 figures

Scientific paper

10.1021/nl200523f

We have performed first-principles calculations to study the lattice vibrational modes and their Raman activities in silicon nanowires (SiNWs). Two types of characteristic vibrational modes are examined: high-frequency optical modes and low-frequency confined modes. Their frequencies have opposite size dependence with a red shift for the optical modes and a blue shift for the confined modes as the diameter of SiNWs decreases. In addition, our calculations show that these vibrational modes can be detected by Raman scattering measurements, providing an efficient way to estimate the size of SiNWs.

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