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VOLUME 20 (1974) | ISSUE 5 | PAGE 300
Singularity of polariton radiation of ZnTe crystals at high excitation levels
We investigated the emission spectra of ZnTe crystals (T=4.2 and 1.6 °K) excited by an argon laser. The results are interpreted in terms of polariton luminescence of the lower and upper polariton branches. The appearance of a narrow peak—"needle" (half-width » I0"s eV) for the emission of the upper polariton branch, at T = 1.6°K and at an excitation density 4xl021 photons/cm2 sec, is attributed to the possibility of attaining Bose-Einstein condensation of the excitons on the upper polariton branch in a state with fc =;0.