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arXiv 2106.07201cond-mat.mtrl-sci
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IV族半导体晶格动力学的扩展Hubbard赝杂化泛函从头算研究

Ab initio study of lattice dynamics of group IV semiconductors using pseudohybrid functionals for extended Hubbard interactions

Wooil Yang, Seung-Hoon Jhi, Sang-Hoon Lee, Young-Woo Son

摘要:

本文利用完全从头算扩展的Hubbard泛函研究了IV族半导体的晶格动力学。现场和intersite Hubbard相互作用确定自洽最近开发的pseudohybrid泛函,并包括在力计算。我们分析了Pulay力的原子轨道投影仪的选择和力的贡献的现场和intersite哈伯德条款。声子色散,GrUneisen参数和金刚石、硅和锗的晶格热导率,它们是最具代表性的共价键合半导体,被计算并与使用局部、半局部和混合泛函的结果进行比较。扩展的哈伯德泛函产生增加的声子速度和寿命,从而晶格热导率相比,本地和半本地的泛函,同意与实验非常好。考虑到我们的计算需求与简单的局部泛函相当,因此这项工作提出了一种以更高精度进行高通量电子和结构计算的方法。

英文摘要:

We study the lattice dynamics of group IV semiconductors using fully ab-initio extended Hubbard functional. The onsite and intersite Hubbard interactions are determined self-consistently with recently developed pseudohybrid functionals and included in force calculations. We analyze the Pulay forces by the choice of atomic orbital projectors and the force contribution of the onsite and intersite Hubbard terms. The phonon dispersions, Gruneisen parameters, and lattice thermal conductivities of diamond, silicon, and germanium, which are most-representative covalent-bonding semiconductors, are calculated and compared with the results using local, semilocal, and hybrid functionals. The extended Hubbard functional produces increased phonon velocities and lifetimes, and thus lattice thermal conductivities compared to local and semilocal functionals, agreeing with experiments very well. Considering that our computational demand is comparable to simple local functionals, this work thus suggests a way to perform high-throughput electronic and structural calculations with a higher accuracy.

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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