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arXiv 1705.01992cond-mat.mes-hall
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基于第一性原理计算的少层黑磷紧束缚参数化

Tight Binding Parametrization of Few-layer Black Phosphorus from First-Principles Calculations

Marcos G. Menezes, Rodrigo B. Capaz

摘要:

采用基于Slater Koster模型的紧束缚参数化方法对第一性原理计算得到的单层、双层和块状黑磷的能带结构进行拟合。我们发现,我们的模型,其中包括9或17个参数,这取决于是否包括重叠或不,再现相当不错的从头算能带结构在一个很宽的能量范围内,特别是占用带。我们还发现,包括重叠参数提高了质量的适合的导带。另一方面,跳跃和现场的能量是一致的,在整个不同的系统,这是一个迹象表明,我们的模型是适合于多层黑磷和更复杂的情况下,第一性原理计算的计算变得令人望而却步,如无序系统和异质结构与一个大的晶格失配的计算。我们还讨论了该模型的局限性,以及如何拟合程序可以得到改善,更准确地描述附近的费米能量的频带。

英文摘要:

We employ a tight-binding parametrization based on the Slater Koster model in order to fit the band structures of single-layer, bilayer and bulk black phosphorus obtained from first-principles calculations. We find that our model, which includes 9 or 17 parameters depending on whether overlap is included or not, reproduces quite well the ab-initio band structures over a wide energy range, especially the occupied bands. We also find that the inclusion of overlap parameters improves the quality of the fit for the conduction bands. On the other hand, hopping and on-site energies are consistent throughout the different systems, which is an indication that our model is suitable for calculations on multilayer black phosphorus and more complex situations in which first-principles calculations become prohibitive, such as disordered systems and heterostructures with a large lattice mismatch. We also discuss the limitations of the model and how the fit procedure can be improved for a more accurate description of bands in the vicinity of the Fermi energy.

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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