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Nature Research, Scientific Reports, 1(8), 2018

DOI: 10.1038/s41598-018-35510-4

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Raman scattering from the bulk inactive out–of–plane ${{\bf{B}}}_{{\bf{2}}{\bf{g}}}^{{\bf{1}}}$ B 2 g 1 mode in few–layer MoTe2

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractWe report a study of Raman scattering in few-layer MoTe2 focused on high-frequency out-of-plane vibrational modes near 291 cm−1 which are associated with the bulk-inactive ${{\rm{B}}}_{2{\rm{g}}}^{1}$ B 2 g 1 mode. Our temperature-dependent measurements reveal a double peak structure of the feature related to these modes in the Raman scattering spectra of 4- and 5-layer MoTe2. In accordance with literature data, the doublet’s lower- and higher-energy components are ascribed to the Raman-active A1g/${{\bf{A}}{\boldsymbol{^{\prime} }}}_{{\bf{1}}}$ A ′ 1 vibrations involving, respectively, only the inner and surface layers. We demonstrate a strong enhancement of the inner mode’s intensity at low temperature for 1.91 eV and 1.96 eV laser light excitation which suggests a resonant character of the Raman scattering processes probed under such conditions. A resonance of the laser light with a singularity of the electronic density of states at the M point of the MoTe2 Brillouin zone is proposed to be responsible for the observed effects.