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Issue 22, 2015
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Anomalous lattice vibrations of monolayer MoS2 probed by ultraviolet Raman scattering

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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 Image ID:c5cp01347j-t1.gif 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.

Graphical abstract: Anomalous lattice vibrations of monolayer MoS2 probed by ultraviolet Raman scattering

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Publication details

The article was received on 07 Mar 2015, accepted on 27 Apr 2015 and first published on 13 May 2015


Article type: Paper
DOI: 10.1039/C5CP01347J
Citation: Phys. Chem. Chem. Phys., 2015,17, 14561-14568
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    Anomalous lattice vibrations of monolayer MoS2 probed by ultraviolet Raman scattering

    H. Liu, H. Guo, T. Yang, Z. Zhang, Y. Kumamoto, C. Shen, Y. Hsu, L. Li, R. Saito and S. Kawata, Phys. Chem. Chem. Phys., 2015, 17, 14561
    DOI: 10.1039/C5CP01347J

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