Anomalous lattice vibrations of monolayer MoS2 probed by ultraviolet Raman scattering

Hsiang Lin Liu, Huaihong Guo, Teng Yang, Zhidong Zhang, Yasuaki Kumamoto, Chih Chiang Shen, Yu Te Hsu, Lain Jong Li, Riichiro Saito, Satoshi Kawata

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

We present a comprehensive Raman scattering study of monolayer MoS2 with increasing laser excitation energies ranging from the near-infrared to the deep-ultraviolet. The Raman scattering intensities from the second-order phonon modes are revealed to be enhanced anomalously by only the ultraviolet excitation wavelength 354 nm. We demonstrate theoretically that such resonant behavior arises from a strong optical absorption that forms near the Γ point and of the band structure and an inter-valley resonant electronic scattering by the M-point phonons. These results advance our understanding of the double resonance Raman scattering process in low-dimensional semiconducting nanomaterials and provide a foundation for the technological development of monolayer MoS2 in the ultraviolet frequency range.

Original languageEnglish
Pages (from-to)14561-14568
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume17
Issue number22
DOIs
Publication statusPublished - 2015 Jun 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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