We investigate the scattering of vibrational waves at the step interface between two structurally different waveguides, namely, one and two coupled atomic layers occupying the half spaces on either side of the step. The model presented is also instructive for the study of the scattering of surface phonons by random isolated steps in vicinal surfaces. The complexity of the scattering of vibrational waves, in contrast with coherent electron transport, which in part may be attributed to the vector character of the vibrational fields, is further enhanced in the present study owing to the intrinsic asymmetry of the system normal to the step as well as to its two-dimensional extended character. A detailed discussion of the reflection and transmission spectra is presented for the scattering processes in the two possible geometries normal to the step.
|Number of pages||10|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1999|
ASJC Scopus subject areas
- Condensed Matter Physics