Excitonic polariton dispersion in CuBr determined by resonant Raman scattering under two-photon excitation of excitonic molecules

The excitonic polariton dispersion in wide k-space for k∥111] is measured through the two-photon-resonant Raman scattering with the use of the double beam excitation technique. The k-linear effect, the heavy and light masses and the polariton effect of the Z_1,2 exciton are clarified.