Vibrational properties of Cu nanowires

Vibrational behavior of metal nanowires under tensile stress

“…However, detailed calculations for obtaining phonon dispersion curves together with the displacement vectors, which is beyond the scope of this work, are needed to confirm existence of such localized modes on these particular Cu nanowires. Furthermore, we previously calculated LDOS of a center atom (CA) of a strain-free, 5×5 type Cu nanowire along the x− and z−direction, and concluded that the high frequency modes above the bulk band are due to mostly the vibrations along the directions parallel to the cross-sectional plane 15 . The characteristics of these high frequency modes might be similar to the breathing modes− the lowest-order pure-compressional modes − observed in nanotubes as the modes are within the longitudinal part of the phonon spectrum with the vibrations along the radial direction.…”