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Complex Raman Tensor in Helicity-Changing Raman Spectra of Black Phosphorus under Circularly Polarized Light.
Han, Shiyi; Zhao, Yan; Tuan Hung, Nguyen; Xu, Bo; Saito, Riichiro; Zhang, Jin; Tong, Lianming.
Afiliação
  • Han S; College of Chemistry and Molecular Engineering, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, P. R. China.
  • Zhao Y; College of Chemistry and Molecular Engineering, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, P. R. China.
  • Tuan Hung N; Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, P. R. China.
  • Xu B; Frontier Research Institute for Interdisciplinary Science, Tohoku University, Sendai 980-8578, Japan.
  • Saito R; College of Chemistry and Molecular Engineering, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, P. R. China.
  • Zhang J; Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, P. R. China.
  • Tong L; Department of Physics, Tohoku University, Sendai 980-8578, Japan.
J Phys Chem Lett ; 13(5): 1241-1248, 2022 Feb 10.
Article em En | MEDLINE | ID: mdl-35089044
In anisotropic two-dimensional materials, complex values of Raman tensors are necessary to explain the abnormal linearly polarized Raman spectra. In this work, we measured the helicity-changing Raman spectra of few-layer black phosphorus (BP) excited by circularly polarized light. We observed that the polarized Raman intensities of the Ag modes show a deflection angle that depends on the sample orientation, thickness, and laser excitation energy. To understand the deflection, we calculated the resonant Raman spectra by first-principles calculations, which give complex Raman tensors as a function of laser excitation energy. In particular, the phase difference between the elements of the complex Raman tensor is relevant to the deflection angle. The calculated results of monolayer BP reproduce the experimental helicity-resolved Raman spectra of few-layer BP satisfactorily.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: J Phys Chem Lett Ano de publicação: 2022 Tipo de documento: Article País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: J Phys Chem Lett Ano de publicação: 2022 Tipo de documento: Article País de publicação: Estados Unidos