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Correct Implementation of Polarization Constants in Wurtzite Materials and Impact on III-Nitrides

机译:纯盐材料中的偏振常数的正确实施以及对III-氮化物的影响

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Accurate values for polarization discontinuities between pyroelectric materials are critical for understanding and designing the electronic properties of heterostructures. For wurtzite materials, the zincblende structure has been used in the literature as a reference to determine the effective spontaneous polarization constants. We show that, because the zincblende structure has a nonzero formal polarization, this method results in a spurious contribution to the spontaneous polarization differences between materials. In addition, we address the correct choice of “improper” versus “proper” piezoelectric constants. For the technologically important III-nitride materials GaN, AlN, and InN, we determine polarization discontinuities using a consistent reference based on the layered hexagonal structure and the correct choice of piezoelectric constants, and discuss the results in light of available experimental data.
机译:热电材料之间的极化不连续性的精确值对于理解和设计异质结构的电子性质至关重要。对于紫零材料,Zincblende结构已在文献中用于确定有效的自发极化常数。我们表明,由于锌博兵结构具有非零形式极化,因此该方法导致对材料之间的自发极化差异的寄生贡献。此外,我们解决了“正确”压电常数的正确选择“不正确”。对于技术重要的III族氮化物材料GaN,Aln和Inn,我们使用基于层状六边形结构的一致参考确定偏振不连续性,并根据压电常数的正确选择,并根据可用的实验数据讨论结果。

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