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Raman spectra of ZnO single crystal at selected different temperatures. Inset: zoom on the (low) peak measured with the high resolution setup at 4 and 300 K.
(a) (low) linewidth (left scale) and lifetime (right scale) temperature dependence. Both phonon down-conversion (solid line) and three phonon up-conversion (dots) scenarios are in good agreement with experimental data (triangles). Red dot is the high resolution value. Inset: Schematic view of the phonon dispersion curve close to the point showing the scarce available decay channels for the (low) phonon. (b) Same as (a) but for (high). The phonon down-conversion scenario (solid line) accounts well for the observed behavior.
Annealing conditions and observed linewidth after a 24 h treatment of the (low) ZnO phonon Raman mode for different samples. The two series of ZnO single crystals were grown by vapor transport under relatively Zn-rich conditions, using isotopically natural materials: series B were grown under richer zinc conditions than series A.
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