Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Anomalous polarization pattern evolution of Raman modes in few-layer ReS2 by angle-resolved polarized Raman spectroscopy
Nanoscale ( IF 5.8 ) Pub Date : 2021-12-27 , DOI: 10.1039/d1nr06733h Ruowei Wu 1 , Mei Qi 2 , Qiyi Zhao 3 , Yuanyuan Huang 1 , Yixuan Zhou 1 , Xinlong Xu 1
Nanoscale ( IF 5.8 ) Pub Date : 2021-12-27 , DOI: 10.1039/d1nr06733h Ruowei Wu 1 , Mei Qi 2 , Qiyi Zhao 3 , Yuanyuan Huang 1 , Yixuan Zhou 1 , Xinlong Xu 1
Affiliation
|
Low-symmetry of ReS2 has not only in-plane but also out-of-plane anisotropic light scattering, which is complicated, yet interesting with intrinsic strong electron–phonon coupling. In such a case, the Raman tensor also gets sophisticated with nine non-zero elements, which is layer-dependent for different Raman modes. Herein, we systematically investigated the polarization pattern evolution of both in-plane and out-of-plane Raman modes of few-layer ReS2 by angle-resolved polarized Raman spectroscopy. We found that in-plane Raman modes with less layer-dependence could be used to determine the crystal orientation (Re-chain direction) due to the weak electron–phonon interaction between layers. However, the out-of-plane and mixed vibration Raman modes demonstrate much evident layer-dependence due to the obvious electron–phonon interaction between layers. As such, the polarization patterns for the out-of-plane vibration Raman modes are distorted with layers in not only petal types but also maximum Raman intensity directions. This distortion is mainly due to the phase difference between Raman elements, which are complex values due to the near bandgap excitation laser. The results reveal that deep insights into anisotropy in low-symmetry two-dimensional materials could afford not only rich physics but also potential polarized optoelectronic devices.
中文翻译：
角分辨偏振拉曼光谱在少层 ReS2 中拉曼模式的异常偏振模式演变
ReS 2的低对称性不仅具有面内而且还具有面外各向异性光散射，这很复杂，但对固有的强电子-声子耦合很有趣。在这种情况下，拉曼张量也变得复杂，具有九个非零元素，这对于不同的拉曼模式是层相关的。在此，我们系统地研究了少层 ReS 2的面内和面外拉曼模式的偏振模式演变通过角分辨偏振拉曼光谱。我们发现，由于层间电子-声子相互作用较弱，层间依赖性较小的面内拉曼模式可用于确定晶体取向（重链方向）。然而，由于层间明显的电子 - 声子相互作用，面外和混合振动拉曼模式表现出非常明显的层依赖性。因此，面外振动拉曼模式的偏振模式不仅在花瓣类型上而且在最大拉曼强度方向上都有层扭曲。这种失真主要是由于拉曼元件之间的相位差，这是由于近带隙激发激光的复杂值。
更新日期：2022-01-19
中文翻译：
角分辨偏振拉曼光谱在少层 ReS2 中拉曼模式的异常偏振模式演变
ReS 2的低对称性不仅具有面内而且还具有面外各向异性光散射，这很复杂，但对固有的强电子-声子耦合很有趣。在这种情况下，拉曼张量也变得复杂，具有九个非零元素，这对于不同的拉曼模式是层相关的。在此，我们系统地研究了少层 ReS 2的面内和面外拉曼模式的偏振模式演变通过角分辨偏振拉曼光谱。我们发现，由于层间电子-声子相互作用较弱，层间依赖性较小的面内拉曼模式可用于确定晶体取向（重链方向）。然而，由于层间明显的电子 - 声子相互作用，面外和混合振动拉曼模式表现出非常明显的层依赖性。因此，面外振动拉曼模式的偏振模式不仅在花瓣类型上而且在最大拉曼强度方向上都有层扭曲。这种失真主要是由于拉曼元件之间的相位差，这是由于近带隙激发激光的复杂值。
京公网安备 11010802027423号