Focusing of near-zone-edge acoustic phonons in Ge is studied based on the dynamical matrix of lattice derived by Herman. We find that the focusing behaviors of transverse phonons in the dispersive region are remarkably different from those in the long-wavelength limit and well account for a number of substantial features of the ballistic-phonon images at about 1 THz observed recently by Dietsche et al.
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Shin-ichiro Tamura (1982) studied this question.
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