Polarized Raman spectroscopy in low-symmetry 2D materials: angle-resolved experiments and complex number tensor elements.
Polarized Raman spectroscopy in low-symmetry 2D materials: angle-resolved experiments and complex number tensor elements.
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低对称性二维材料中的偏振拉曼光谱：角度分辨实验和复数张量元素。
DOI：
10.1039/d1cp03626b
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
B. R. Carvalho
中科院分区：
文献类型：
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作者：
M. Pimenta;G. C. Resende;H. Ribeiro;B. R. Carvalho
在这篇综述中，我们讨论了偏振拉曼光谱学研究光学各向异性二维材料的能力，这些材料属于正交晶系、单斜晶系和三斜晶系。我们首先表明，峰值强度的偏振依赖性所描述的拉曼张量是唯一的每个声子模式，然后我们讨论如何确定张量元素的角度分辨偏振测量通过分析在平行和交叉偏振散射配置的强度。我们提出了正交黑磷和单斜1 T '-MoTe 2的具体例子，其中的拉曼张量具有零元素，其主轴与晶体学的一致，然后讨论了三斜ReS 2和ReSe 2的结果，其中的拉曼张量的轴不与晶体学的轴一致，所有元素都是非零的。我们表明，拉曼张量元素，在一般情况下，由复数和张量元素之间的相位差需要描述的实验结果。在拉曼强度的量子模型框架内，讨论了拉曼张量对激发激光能量和样品厚度的依赖关系。我们表明，电子-声子相互作用的波矢依赖性对于解释每个声子模式的不同拉曼张量至关重要。最后，我们结束了我们的结论性意见和角度分辨偏振拉曼光谱在光学各向异性的二维材料进行探索。
In this perspective review, we discuss the power of polarized Raman spectroscopy to study optically anisotropic 2D materials, belonging to the orthorhombic, monoclinic and triclinic crystal families. We start by showing that the polarization dependence of the peak intensities is described by the Raman tensor that is unique for each phonon mode, and then we discuss how to determine the tensor elements from the angle-resolved polarized measurements by analyzing the intensities in both the parallel- and cross-polarized scattering configurations. We present specific examples of orthorhombic black phosphorus and monoclinic 1T'-MoTe2, where the Raman tensors have null elements and their principal axes coincide with the crystallographic ones, followed by a discussion on the results for triclinic ReS2 and ReSe2, where the axes of the Raman tensor do not coincide with the crystallographic axes and all elements are non-zero. We show that the Raman tensor elements are, in general, given by complex numbers and that phase differences between tensor elements are needed to describe the experimental results. We discuss the dependence of the Raman tensors on the excitation laser energy and thickness of the sample within the framework of the quantum model for the Raman intensities. We show that the wavevector dependence of the electron-phonon interaction is essential for explaining the distinct Raman tensor for each phonon mode. Finally, we close with our concluding remarks and perspectives to be explored using angle-resolved polarized Raman spectroscopy in optically anisotropic 2D materials.
二维材料及其他领域的超导性
DOI：
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发表时间：
2018
期刊：
影响因子：
--
作者：
Yurimoto,H.;Bajo;K.;Jurewicz,A.;Olinger;C. T.;Burnett;D. S.;Sakaguchi;I.;Suzuki;T.;Itose;S.;Ishihara;M.;Uchino;K. and Nagao;K.;Kenjiro Takazawa;O.A. Tretiakov;葛原 茂樹;山田真子・磯﨑哲夫;國廣昇;Yoshihiro Iwasa
通讯作者：
Yoshihiro Iwasa