Excitonic polaritons and biexcitons in PbI2

  title={Excitonic polaritons and biexcitons in PbI2},
  author={R. Levy and Albert Bivas and B. H{\"o}nerlage and Qing Yu},
Abstract The existence of biexcitons is first shown by studying the luminescence assisted two-photon absorption of PbI 2 . Two-photon absorption being allowed, resonance enhanced two-photon Raman scattering could be observed due to the giant oscillator strength of the exciton-biexciton transition. The process is used to study directly the dispersion relations of ordinary and extraordinary excitonic polaritons which exist because of the crystal anisotropy. 

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