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arXiv 1206.0138cond-mat.mtrl-sciphysics.comp-ph
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相变存储材料$\mathrm{Ge_{2}Sb_{2}Te_{5}}$光电性质的杂化密度泛函研究

Hybrid density functional study of electronic and optical properties of phase change memory material: $\mathrm{Ge_{2}Sb_{2}Te_{5}}$

T. Kaewmaraya, M. Ramzan, 1 H. Löfås, Rajeev Ahuja

摘要:

本文采用杂化密度泛函方法(HSE 06)研究了相变存储材料$\mathrm{Ge_{2}Sb_{2}Te_{5}}$的晶体结构、电子结构和光学性质。我们计算了该材料的三种稳定结构的结构参数、带隙和介电函数。我们还分析了电子的电荷分布使用贝德的电荷分析理论。我们发现杂化密度泛函稍微高估了C参数的值。然而,总的来说,我们的计算结果与使用混合密度泛函(HSE06)是非常接近可用的实验值比使用PBE功能计算。具体地说,用HSE06计算的这种材料的电子带隙值与文献中可用的实验数据吻合得很好。此外,我们进行了电荷分析,发现朴素离子模型不能解释组成原子之间的电荷分布,显示了该化合物的复杂性。

英文摘要:

In this article, we use hybrid density functional (HSE06) to study the crystal and electronic structures and optical properties of well known phase change memory material $\mathrm{Ge_{2}Sb_{2}Te_{5}}$. We calculate the structural parameters, band gaps and dielectric functions of three stable structures of this material. We also analyze the electron charge distribution using the Bader's theory of charge analysis. We find that hybrid density functional slightly overestimate the value of 'C' parameter. However, overall, our results calculated with the use of hybrid density functional (HSE06) are very close to available experimental values than calculated with the use of PBE functional. Specifically, the electronic band gap values of this material calculated with HSE06 are in good agreement with the available experimental data in the literature. Furthermore, we perform the charge analysis and find that naive ionic model fails to explain the charge distribution between the constituent atoms, showing the complex nature of this compound.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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