Deep-ultraviolet Raman scattering spectroscopy of monolayer WS2

Hsiang Lin Liu*, Teng Yang, Yuki Tatsumi, Ye Zhang, Baojuan Dong, Huaihong Guo, Zhidong Zhang, Yasuaki Kumamoto, Ming Yang Li, Lain Jong Li, Riichiro Saito, Satoshi Kawata

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

16 引文 斯高帕斯(Scopus)

摘要

Raman scattering measurements of monolayer WS2 are reported as a function of the laser excitation energies from the near-infrared (1.58 eV) to the deep-ultraviolet (4.82 eV). In particular, we observed several strong Raman peaks in the range of 700∼850 cm−1 with the deep-ultraviolet laser lights (4.66 eV and 4.82 eV). Using the first-principles calculations, these peaks and other weak peaks were appropriately assigned by the double resonance Raman scattering spectra of phonons around the M and K points in the hexagonal Brillouin zone. The relative intensity of the first-order E2g1 to A1g peak changes dramatically with the 1.58 eV and 2.33 eV laser excitations, while the comparable relative intensity was observed for other laser energies. The disappearance of the E2g1 peak with the 1.58 eV laser light comes from the fact that valley polarization of the laser light surpasses the E2g1 mode since the E2g1 mode is the helicity-exchange Raman mode. On the other hand, the disappearance of the A1g peak with the 2.33 eV laser light might be due to the strain effect on the electron-phonon matrix element.

原文英語
文章編號11398
期刊Scientific reports
8
發行號1
DOIs
出版狀態已發佈 - 2018 12月 1

ASJC Scopus subject areas

  • 多學科

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