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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 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

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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