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Lattice Vibration and Raman Scattering in Anisotropic Black Phosphorus Crystals
Small Methods ( IF 10.7 ) Pub Date : 2018-04-19 , DOI: 10.1002/smtd.201700409 Nannan Mao 1 , Shuqing Zhang 1 , Juanxia Wu 1 , Jin Zhang 1 , Lianming Tong 1
Small Methods ( IF 10.7 ) Pub Date : 2018-04-19 , DOI: 10.1002/smtd.201700409 Nannan Mao 1 , Shuqing Zhang 1 , Juanxia Wu 1 , Jin Zhang 1 , Lianming Tong 1
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Here, an overview of recent advances on the Raman spectroscopic studies of 2D black phosphorus (BP) crystals is provided, covering the fundamentals of Raman scattering such as the crystal symmetry and the assignment of the phonon modes, the Raman selection rule that can be used to determine the crystalline orientation, the interlayer coupling that gives rise to the interlayer shear and breathing modes, and the effects of perturbation such as temperature, strain, and pressure. Due to the low in‐plane symmetry of BP, particular attention is given to the anisotropic electron–photon and electron–phonon interactions in BP, which have strikingly distinct characteristics compared with other isotropic 2D materials. The abnormal polarized Raman scattering of anisotropic BP crystals and its dependence on the excitation energy, thickness, and phonon modes are discussed from the viewpoints of the complex Raman tensors and the optical birefringence effect. Furthermore, the calibration of the Raman selection rule in anisotropic BP crystals is discussed, and the versatility of Raman spectroscopy in characterizing the structure of BP, such as the layer number, the type of edges, and the crystalline orientation are considered.
中文翻译：
各向异性黑磷晶体的晶格振动和拉曼散射
在此，概述了二维黑磷（BP）晶体拉曼光谱研究的最新进展，涵盖了拉曼散射的基本原理，例如晶体对称性和声子模式的分配，可以使用的拉曼选择规则确定晶体的取向，引起层间剪切和呼吸模式的层间耦合以及诸如温度，应变和压力之类的扰动效应。由于BP的面内对称性低，因此需要特别注意BP中的各向异性电子-光子和电子-声子相互作用，与其他各向同性的2D材料相比，它们具有显着不同的特性。各向异性BP晶体的异常极化拉曼散射及其与激发能，厚度，从复数拉曼张量和光学双折射效应的角度讨论了声子模和声子模。此外，讨论了各向异性BP晶体中拉曼选择规则的校准，并考虑了拉曼光谱在表征BP结构（例如层数，边缘类型和晶体取向）方面的多功能性。
更新日期：2018-04-19
中文翻译：
各向异性黑磷晶体的晶格振动和拉曼散射
在此，概述了二维黑磷（BP）晶体拉曼光谱研究的最新进展，涵盖了拉曼散射的基本原理，例如晶体对称性和声子模式的分配，可以使用的拉曼选择规则确定晶体的取向，引起层间剪切和呼吸模式的层间耦合以及诸如温度，应变和压力之类的扰动效应。由于BP的面内对称性低，因此需要特别注意BP中的各向异性电子-光子和电子-声子相互作用，与其他各向同性的2D材料相比，它们具有显着不同的特性。各向异性BP晶体的异常极化拉曼散射及其与激发能，厚度，从复数拉曼张量和光学双折射效应的角度讨论了声子模和声子模。此外，讨论了各向异性BP晶体中拉曼选择规则的校准，并考虑了拉曼光谱在表征BP结构（例如层数，边缘类型和晶体取向）方面的多功能性。
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