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Raman tensor of layered black arsenic
Journal of Raman Spectroscopy ( IF 2.5 ) Pub Date : 2020-06-29 , DOI: 10.1002/jrs.5922
Yanming Zhu 1 , Wei Zheng 1 , Weiliang Wang 2 , Siqi Zhu 1 , Lu Cheng 1 , Linxuan Li 1 , Zeguo Lin 1 , Ying Ding 1 , Mingge Jin 1 , Feng Huang 1
Affiliation  

Due to the similar atom arrangement with black phosphorus, black arsenic also has obvious Raman anisotropy at both the base and cross planes. However, the polarization characteristics of black arsenic have been rarely reported so far with most relevant studies devoted to the base plane. Here, to compensate for the blank of the anisotropy in cross plane, we implemented a systematical angle‐resolved polarized Raman measurement on both planes of layered black arsenic and observed that the Raman intensity ratios (Ixx : Iyy : Izz) of optical phonons urn:x-wiley:03770486:media:jrs5922:jrs5922-math-0001 and urn:x-wiley:03770486:media:jrs5922:jrs5922-math-0002 modes along different axes are 1:4.8:2.76 and 6.9:1:5.7, respectively. Based on the definition of Raman intensity, we abstracted integral Raman tensors of black arsenic. In addition, according to density functional theory, it can be affirmed that the Raman anisotropy of Ag mode is sourced from the anisotropy of differential polarizability along different crystal axes.

中文翻译:

分层黑色砷的拉曼张量

由于黑磷的原子排列相似,因此黑砷在基面和交叉面上也都具有明显的拉曼各向异性。但是,迄今为止,几乎没有关于黑砷的极化特性的报道,而大多数相关研究都集中在基平面上。在这里,为了补偿横断面中的各向异性,我们在层状黑砷的两个平面上进行了系统的角度分辨极化拉曼测量,并观察了光学拉曼强度比(I xxI yyI zz)沿不同轴的声子缸:x-wiley:03770486:media:jrs5922:jrs5922-math-0001缸:x-wiley:03770486:media:jrs5922:jrs5922-math-0002模分别为1:4.8:2.766.9:1:5.7, 分别。基于拉曼强度的定义,我们提取了黑色砷的积分拉曼张量。另外,根据密度泛函理论,可以确定A g模的拉曼各向异性源于沿不同晶轴的差分极化率的各向异性。
更新日期:2020-06-29
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