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arXiv 0801.0421cond-mat.mtrl-sci
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III族氮化物AlN、GaN和InN的谱带参数的一致性

Consistent set of band parameters for the group-III nitrides AlN, GaN, and InN

Patrick Rinke, Momme Winkelnkemper, Abdallah Qteish, Dieter Bimberg, Jorg Neugebauer, Matthias Scheffler

摘要:

我们已经推导出一致的组的带参数(带隙,晶体场分裂,带隙变形势,有效质量,Luttinger和EP参数)的AlN,GAN,和InN的锌-ZnO和纤锌矿相采用多体微扰理论在G 0 W 0近似。G 0 W 0方法已与密度泛函理论(DFT)计算相结合的精确交换优化有效势方法(OEPx),以克服局部密度或梯度校正的DFT泛函(LDA和GGA)的局限性。伽马点附近的能带结构已被用于直接参数化4 × 4 k.p哈密顿量,以捕获导带中的非抛物性和纤锌矿相的更复杂的价带结构。我们证明,以这种方式得到的带参数与现有的实验数据非常吻合,并提供可靠的预测,迄今为止尚未确定的所有参数的实验。

英文摘要:

We have derived consistent sets of band parameters (band gaps, crystal field-splittings, band gap deformation potentials, effective masses, Luttinger and EP parameters) for AlN, GaN, and InN in the zinc-blende and wurtzite phases employing many-body perturbation theory in the G0W0 approximation. The G0W0 method has been combined with density-functional theory (DFT) calculations in the exact-exchange optimized effective potential approach (OEPx) to overcome the limitations of local-density or gradient-corrected DFT functionals (LDA and GGA). The band structures in the vicinity of the Gamma-point have been used to directly parameterize a 4x4 k.p Hamiltonian to capture non-parabolicities in the conduction bands and the more complex valence-band structure of the wurtzite phases. We demonstrate that the band parameters derived in this fashion are in very good agreement with the available experimental data and provide reliable predictions for all parameters which have not been determined experimentally so far.

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