Surface Vibration Modes in Monatomic Body-Centered Cubic Crystals: The (001) Surface.
TEXAS UNIV AUSTIN DEPT OF PHYSICS
Pagination or Media Count:
Surface vibration modes for the 001 surface of monatomic bcc crystals are examined using a simple model which allows for full cubic anisotropy and which exactly fits the second-order elastic constants. For both the semi-infinite crystal and the crystal slab approaches, the effect of anisotropy is examined for iron, vanadium and isotropic tungsten. For each crystal a surface mode with shear-horizontal SH polarization is found below the SH bulkband along the 100 direction but not along the 110 direction. For long wavelength, the frequency of this surface mode departs from the bulk band edge as the inverse cube of wavelength and the localization depth is proportional to the inverse square of wavelength. A surface mode with SH polarization is found above the SH bulkband in both the 100 and 110 directions for vanadium. In addition to the Rayleigh waves, a number of short wavelength surface modes with sagittal-plane polarization are found for each crystal. Modified author abstract
- Solid State Physics