Evidence for two-photon generation of propagating bipolaritons in CuCl

J. I. Jang*, J. B. Ketterson, M. A. Anderson, R. P.H. Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Unlike the conventional theory of giant oscillator strength, the recently proposed bipolariton model describes two-photon excitation of an excitonic molecule in terms of resonant polariton-polariton Coulomb scattering. Using angle-resolved spectroscopy, we directly measure the angular dependence of the molecule luminescence under resonant two-photon excitation. We find that the observed photoluminescence is highly directional and well correlated with the propagation direction of the incident laser. This observation unambiguously supports the core idea of this model that replaces the idea of a biexciton by that of a mutually bound propagating polariton molecule.

Original languageEnglish (US)
Article number233201
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number23
StatePublished - Dec 10 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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