Anomalous lattice vibrations of monolayer MoS 2 probed by ultraviolet Raman scattering
AuthorsLiu, Hsiang Lin
Shen, Chih Chiang
Hsu, Yu Te
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractWe 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.
CitationLiu H-L, Guo H, Yang T, Zhang Z, Kumamoto Y, et al. (2015) Anomalous lattice vibrations of monolayer MoS 2 probed by ultraviolet Raman scattering . Phys Chem Chem Phys 17: 14561–14568. Available: http://dx.doi.org/10.1039/c5cp01347j.
Sponsors51331006, NSFC, National Natural Science Foundation of China
PublisherRoyal Society of Chemistry (RSC)
JournalPhys. Chem. Chem. Phys.
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