Inverse Raman scattering resonant to excitonic polariton states in red-HgI2 and 2H-PbI2 single crystals at 1.6 K is observed. The inverse Raman absorption line shape is calculated with a polariton dispersion relation renormalized by the intense pump laser. Deformation potentials for A1g optical phonons are estimated from the Raman cross sections to be about 2 eV for these materials, which are rather small compared to those of T2 transverse optical phonons in tetrahedral semiconductors.
ASJC Scopus subject areas
- Physics and Astronomy(all)