Raman tensor of layered black phosphorus  

作　　者：Yanming Zhu Wei Zheng Weiliang Wang Siqi Zhu Linxuan Li Lu Cheng Mingge Jin Ying Ding Feng Huang 

机构地区：[1]State Key Laboratory of Optoelectronic Materials and Technologies,School of Materials,Sun Yat-sen University,Guangzhou 510275,Guangdong,China

出　　处：《PhotoniX》2020年第1期95-103,共9页智汇光学（英文）

基　　金：support of this work is from the National Natural Science Foundation of China(Nos.91333207,61427901,61604178,91833301 and U1505252).

摘　　要：Black phosphorus has a strong Raman anisotropy on the basal and cross planes dueto its orthorhombic crystal structure. However, almost all the studies on blackphosphorus’ anisotropy focus on basal plane with the cross plane neglected. Here,we performed a systematic angle-resolved polarized Raman scattering on both thebasal and cross planes of black phosphorus and obtained its integral Raman tensors.It is discovered that when the polarization direction of excitation light is alongdifferent crystal axes, the Raman intensity ratio (Ixx : Iyy: Izz) of A1g mode is 256:1:5.Besides, via calculation, it is confirmed that the strong Raman anisotropy mainlycomes from different differential polarizability alone different directions. Thisphenomenon is also observed when it comes to the A2g mode.

关 键 词：Black phosphorus Polarized Raman spectrum Differential polarizability Raman tensor 

分 类 号：O61[理学—无机化学]