Acoustic vibrations of anisotropic nanoparticles

Acoustic vibrations of nanoparticles made of materials with anisotropic elasticity and nanoparticles with nonspherical shapes are theoretically investigated using a homogeneous continuum model. Cubic, hexagonal, and tetragonal symmetries of the elasticity are discussed, as are spheroidal, cuboctahedral, and truncated cuboctahedral shapes. Tools are described to classify the different vibrations and, for example, help identify the modes having a significant low-frequency Raman-scattering cross section. Continuous evolutions of the modes starting from those of an isotropic sphere coupled with the determination of the irreducible representation of the branches permit some qualitative statements to be made about the nature of various modes. For spherical nanoparticles, a more accurate picture is obtained through projections onto the vibrations of an isotropic sphere.