Abstract
Photoluminescence and electronic Raman scattering of undoped ZnTe at 4.2K is observed. Using a pulsed dye laser tuned through the range of the IS polariton, the polariton bands, (A, oX) bound exciton line and the high excitation band can be excited by a two-photon absorption process. The LO-phonon sideband exhibits a non-thermal energy distribution of the polaritons, which does not vary appreciably when polariton-polariton scattering processes occur. Under high intensity excitation Raman scattering by the plasmon-phonon coupled mode is observed, with shift of ω +=34meV. This is taken as evidence for the presence of an electron-hole plasma. The corresponding pair density is ∼9×10 17cm -3 and is found to be independent of excitation intensity in the range of 10 15–10 16 photons/cm 2.
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