Abstract
Phonon-imaging experiments reveal the angular distribution of high-frequency acoustic-phonon transmission through an As/AlAs superlattice. Phonon stop bands due to Bragg reflection at the folded-zone boundary are observed for both longitudinal and fast transverse phonons. A newly predicted intrazone stop band due to coupling between acoustic modes is detected.
- Received 9 February 1987
DOI:https://doi.org/10.1103/PhysRevLett.58.2446
©1987 American Physical Society