闪锌矿MTe (M=Zn/Mg)的几何结构、弹性性质、电子结构和光学性质

The structural, elastic, electronic, and optical properties of zinc-blende MTe (M=Zn/Mg) compounds were studied. The ultrasoft pseudopotential plane wave (PP-PW) method, based on density functional theory (DFT) within generalized gradient approximation (GGA), was used. Hybrid density functionals were applied to correct band gaps. Cubic ZnTe and MgTe are both direct band gap semiconductors, and calculated lattice parameters, elastic constants, and bulk moduli agree with previous results. Debye temperatures deduced from elastic constants for ZnTe and MgTe are 758 and 585 K, respectively. The dielectric function, refraction index, reflectivity and energy loss spectra were obtained and analyzed based on electronic band structures and densities of states.