Raman tensor of layered black phosphorus

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

doi:10.1186/s43074-020-00017-7

Raman tensor of layered black phosphorus

doi: 10.1186/s43074-020-00017-7

基金项目:

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

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出版历程
- 收稿日期: 2020-04-02
- 录用日期: 2020-07-06
- 网络出版日期: 2020-07-20

Raman tensor of layered black phosphorus

State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials, Sun Yat-sen University, Guangzhou, 510275, Guangdong, China

Funds:

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

摘要

摘要: Black phosphorus has a strong Raman anisotropy on the basal and cross planes due to its orthorhombic crystal structure. However, almost all the studies on black phosphorus' anisotropy focus on basal plane with the cross plane neglected. Here, we performed a systematic angle-resolved polarized Raman scattering on both the basal and cross planes of black phosphorus and obtained its integral Raman tensors. It is discovered that when the polarization direction of excitation light is along different crystal axes, the Raman intensity ratio (I_xx:I_yy:I_zz) of A_g¹ mode is 256:1:5. Besides, via calculation, it is confirmed that the strong Raman anisotropy mainly comes from different differential polarizability alone different directions. This phenomenon is also observed when it comes to the A_g² mode.
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Abstract: Black phosphorus has a strong Raman anisotropy on the basal and cross planes due to its orthorhombic crystal structure. However, almost all the studies on black phosphorus’ anisotropy focus on basal plane with the cross plane neglected. Here, we performed a systematic angle-resolved polarized Raman scattering on both the basal and cross planes of black phosphorus and obtained its integral Raman tensors. It is discovered that when the polarization direction of excitation light is along different crystal axes, the Raman intensity ratio (I_xx : I_yy: I_zz) of $ {A}_g^1 $ mode is 256:1:5. Besides, via calculation, it is confirmed that the strong Raman anisotropy mainly comes from different differential polarizability alone different directions. This phenomenon is also observed when it comes to the $ {A}_g^2 $ mode.
- Black phosphorus /
- Polarized Raman spectrum /
- Differential polarizability /
- Raman tensor

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