63. Lattice dynamics (see also 78.30 Infrared and Raman spectra; for
surface and interface vibrations, see 68.35.J and 68.45.K)
63.10.+a General theory
63.20.-e Phonons in crystal lattices
(for phonons in superconductors, see 74.25.K)
63.20.Dj Phonon states and bands, normal modes, and phonon dispersion
63.20.Kr Phonon-electron and phonon-phonon interactions
63.20.Ls Phonon interactions with other quasiparticles
63.20.Mt Phonon-defect interactions
63.20.Pw Localized modes
63.20.Ry Anharmonic lattice modes
63.22.+m Phonons in low-dimensional structures and small particles
63.50.+x Vibrational states in disordered systems
63.70.+h Statistical mechanics of lattice vibrations and displacive phase
transitions
63.90.+t Other topics in lattice dynamics