Abstract
It has been recognized for several years that the highly anisotropic intensity patterns associated with phonon focusing should undergo radical changes as the phonon wave vectors approach the Brillouin zone boundary [1–4]. This is simply a consequence of the distortion of the acoustic slowness surfaces in the dispersive regime. Phonon focusing patterns of Large-<Inline>1</Inline> phonons must contain detailed information about the curvatures of the slowness surfaces, and thus they provide a potentially new tool for gauging the validity of lattice-dynamics models.KeywordsBallistic PropagationSlowness SurfaceDispersive RegimeMaterial Research LaboratoryBrillouin Zone BoundaryThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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