RETRACTED: ZnO as a material mostly adapted for realization of room-temperature polariton lasers (Retracted article. See vol 201, pg 3373, 2004)

Wannier-Mott excitons in the wurzite-type semiconductor material ZnO are stable at room temperature, have an extremely large oscillator strength and emit blue light. This makes ZnO an excellent potential candidate for the fabrication of room-temperature lasers where the coherent light amplification is ruled by the fascinating mechanism of the Bose-condensation of the exciton-polaritons. We first report the direct optical measurement of the exciton oscillator strength f in ZnO. The longitudinal transverse splitting of the exciton resonances Gamma(5)(B) and Gamma(1)(C) are found to reach the record values of 5 and 7 meV, respectively, two orders of magnitude larger than in GaAs. We then propose a model of ZnO-based microcavity structure that appears to be the most adapted structure for the observation of the polariton laser effect. We thus can compute the phase diagram of the lasing regimes. A value of the threshold power as large as of 2 mW per device (at power density of 3000 W/cm(2)) at room temperature is predicted for this laser structure.