Abstract
Using Green's function techniques we calculate the spectrum for two optic phonons interacting via anharmonic coupling to two acoustic phonons. The single-phonon density of states, which is related to the first-order Raman spectrum, exhibits a zero (antiresonance) between the individual phonon peaks and yields a line shape in excellent agreement with Scott's recent experimental results for AlP.
- Received 6 February 1970
DOI:https://doi.org/10.1103/PhysRevLett.24.1111
©1970 American Physical Society