  In this study, we employ the atomistic wave-packet method to directly
simulate coherent phonon transport and scattering dynamics in an aperiodic
superlattice structure with aperiodically arranged interfaces. Our
investigation reveals that interference dynamics, contingent upon the relative
magnitudes of phonon wavelength, spatial coherence length, and average
interface spacing, profoundly influence transmission spectra and
mode-conversion behavior. Particularly, longer-wavelength phonons possessing
larger coherence lengths exhibit more pronounced destructive interference and
mode-conversion, leading to generally lower transmission. The insights gained
into coherent phonon wave physics from this study can significantly augment the
analysis and design of phononic devices.
