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Optical properties of cadmium telluride in zinc-blende and wurzite structure

机译:碲化镉在闪锌矿和纤锌矿结构中的光学性质

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The optical properties of cadmium telluride including the linear optical dielectric function, the refractive index, the extinction coefficient, the reflectivity and the plasmon energy have been calculated by density functional theory (DFT). The full potential linearized augmented plane wave (FL-LAPW) method was used with the generalized gradient approximation (GGA) including the orbital dependence of the self-energy, i.e. the orbital-dependent potentials of Coulomb and exchange interactions (GGA + U). Using only LDA or GGA methods underestimates the electronic parameters (band gap and band dispersion). Applying orbital-dependent potentials splits the Te-5s state and shifts the binding energies of the Cd4d levels towards the experimentally determined position. The calculated results indicated that although Te-5s and Cd4d overlap, Cd4d plays an important role in absorption and reflectivity constants. The optical constants of CdTe in hexagonal structure exhibit anisotropy (birefringence) in two directions (in basal-plan and c-axis) but the difference is very small in the static limit. (c) 2007 Elsevier B.V. All rights reserved.
机译:采用密度泛函理论(DFT)计算了碲化镉的光学性质,包括线性光学介电函数,折射率,消光系数,反射率和等离子体激元能量。全势线性化增强平面波(FL-LAPW)方法与广义梯度近似(GGA)一起使用,包括自能量的轨道依赖性,即库仑的轨道依赖性势和交换相互作用(GGA + U)。仅使用LDA或GGA方法会低估电子参数(带隙和带分散)。施加与轨道有关的电势会分裂Te-5s态,并使Cd4d能级的结合能移向实验确定的位置。计算结果表明,尽管Te-5s和Cd4d重叠,但Cd4d在吸收常数和反射率常数中起着重要作用。六边形结构的CdTe的光学常数在两个方向(基本平面和c轴)上表现出各向异性(双折射),但在静态极限方面差异很小。 (c)2007 Elsevier B.V.保留所有权利。

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