Abstract
The dielectric properties of ZnTe and CdTe at high temperature are studied by both of vibrational frequencies and experiment damping constants. We perform systematic calculations to investigate the vibrational properties of perfect crystalline ZnTe and CdTe for a wide range of temperature ranging from 0K to 1400K by combining the first-principles methods and quasi-harmonic approximation (QHA). Then, this method is performed to estimate the temperature dependence of dielectric properties of ZnTe and CdTe with the transverse-optical (TO) and longitudinal-optical (LO) mode frequencies and the damping coefficient obtained from experimental data under lower temperature. Furthermore, we extended the estimations of dielectric properties of ZnTe and CdTe to higher temperatures.
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