Soliton-Like Propagation in Biexciton Two-Photon Resonant Region.

We performed sub-ps pulse-propagation experiments around the biexciton two-photon resonance in CuCl, and confirmed the soliton-like propagation of exciton–polariton pulses proposed by one of us [Phys. Rev. Lett.75, 224 (1995)]. In our scheme two-photon nonlinearity compensates exciton–polariton dispersion, and pulse propagate without distortion. We compared our results with the calculated ones and obtained a good agreement between them. [ABSTRACT FROM AUTHOR]