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First-principles calculations of phonons and Raman and infrared spectra in Cd-IV-N_2 compounds

机译:Cd-IV-N_2化合物的声子,拉曼光谱和红外光谱的第一性原理计算

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摘要

A first-principles study of the phonons at the zone center in Cd-IV-N-2 compounds is presented with IV = Si, Ge, Sn. The calculations are performed for the most likely Pbn2(1) crystal structure, after showing that it is indeed lower in total energy compared to the closely related Pmc2(1) structure. The normal mode frequencies are calculated using density functional perturbation theory and symmetry labeled. The longitudinal optical-transverse optical splittings are determined using the Born effective charges which are also reported. These are used to simulate polarized Raman spectra for different scattering configurations as well as the infrared absorption and reflection spectra. The mode frequencies are found to decrease from Si to Ge to Sn as group-IV cation. The spectra show a wide variety of number of prominent peaks and relative intensities in spite of the great similarities of these three materials. Phonon densities of states and their analysis in atom by atom contributions are also reported. Published by AIP Publishing.
机译:Cd-IV-N-2化合物在区域中心的声子的第一性原理研究以IV = Si,Ge,Sn表示。对最可能的Pbn2(1)晶体结构进行计算后,表明它的总能量确实比紧密相关的Pmc2(1)结构要低。正常模式频率是使用密度泛函微扰理论和对称性计算出来的。使用还报告的Born有效电荷确定纵向光学横向分光。这些用于模拟不同散射配置的偏振拉曼光谱以及红外吸收和反射光谱。发现模式频率作为IV族阳离子从Si到Ge再到Sn降低。尽管这三种材料非常相似,但光谱仍显示出多种多样的突出峰和相对强度。还报道了声子的态密度及其在原子中的原子分析。由AIP Publishing发布。

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  • 来源
    《Journal of Applied Physics》 |2018年第20期|205701.1-205701.11|共11页
  • 作者单位

    Case Western Reserve Univ, Dept Phys, 10900 Euclid Ave, Cleveland, OH 44106 USA;

    Case Western Reserve Univ, Dept Phys, 10900 Euclid Ave, Cleveland, OH 44106 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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