Polarization Vectors of Acoustic Phonons Propagating in Mechanically Stable Anisotropic Media

摘要

We consider properties of long wavelength acoustic phonons propagating in anisotropic elastic media. For cubic media we found three subregions of mechanical stability region in which polarization properties of modes are anomalous. To achieve the detailed specification of this unusual behavior we performed vast numerical calculations and devised new characteristics, namely surfaces of polarization angles and maps of polarization enhancement factors.