Observation of Optical Phonons Bound to Neutral Donors

P. J. Dean; D. D. Manchon, Jr; J. J. Hopfield

doi:10.1103/PhysRevLett.25.1027

Observation of Optical Phonons Bound to Neutral Donors

P. J. Dean, D. D. Manchon, Jr., and J. J. Hopfield

Phys. Rev. Lett. 25, 1027 – Published 12 October 1970

Abstract

We have observed new "local-mode lattice vibrations" in GaP, both in Raman scattering and as cooperating phonons in optical transitions. The modes are best qualitatively described as a particle—the LO phonon —bound to a neutral donor, which provides an effective attractive interaction for the phonon. In this analogy, bound states having various angular momenta around the donor can be expected, and both $S$ and $P$ states have been identified experimentally.