Anomalous lattice vibrations of monolayer MoS 2 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

29 Scopus citations

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. © the Owner Societies 2015.
Original languageEnglish (US)
Pages (from-to)14561-14568
Number of pages8
JournalPhys. Chem. Chem. Phys.
Volume17
Issue number22
DOIs
StatePublished - 2015

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