Acoustic vibrations of anisotropic nanoparticles

Details Acoustic vibrations of anisotropic nanoparticles Acoustic vibrations of anisotropic nanoparticles

2009-04-20

arxiv.org/abs/0904.2959v1

Phys. Rev. B 79, 214101 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 9 tables, 6 figures

Scientific paper

10.1103/PhysRevB.79.214101

Acoustic vibrations of nanoparticles made of materials with anisotropic elasticity and nanoparticles with non-spherical 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.

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