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arXiv 1804.02196cond-mat.mtrl-sci
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过渡金属二硫属化合物的振动和介电性质

Vibrational and dielectric properties of the bulk transition metal dichalcogenides

Nicholas A. Pike, Antoine Dewandre, Benoit Van Troeye, Xavier Gonze, Matthieu J. Verstraete

摘要:

过渡金属二硫属化合物的电子、光伏和光学性质引起了人们的兴趣,并使其在许多技术应用中得到了应用。我们提出了一个系统的调查,他们相互联系的振动和介电性能,使用密度泛函理论和密度泛函微扰理论,研究的自旋轨道相互作用和远程e $^-$ - e $^-$相关的影响,作为我们的调查的一部分。本研究证实了自旋-轨道相互作用在这些物理性质中起着很小的作用,而色散修正的直接贡献在描述原子间力常数中是至关重要的。在这里,我们的结构和振动特性的分析,包括拉曼光谱,以及比较实验测量。展示了三种具有不同点群的材料,并展示了十五种现有六方、三方和三斜材料的数据趋势。这一总体情况将使由这些材料组成的器件能够用于新的应用。

英文摘要:

Interest in the bulk transition metal dichalcogenides for their electronic, photovoltaic, and optical properties has grown and led to their use in many technological applications. We present a systematic investigation of their interlinked vibrational and dielectric properties, using density functional theory and density functional perturbation theory, studying the effects of the spin-orbit interaction and of the long-range e$^-$- e$^-$ correlation as part of our investigation. This study confirms that the spin-orbit interaction plays a small role in these physical properties, while the direct contribution of dispersion corrections is of crucial importance in the description of the interatomic force constants. Here, our analysis of the structural and vibrational properties, including the Raman spectra, compare well to experimental measurement. Three materials with different point groups are showcased and data trends on the full set of fifteen existing hexagonal, trigonal, and triclinic materials are demonstrated. This overall picture will enable the modeling of devices composed of these materials for novel applications.

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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