Raman Scattering from the Bulk Inactive Out-of-plane [Formula: See Text] Mode in Few-layer MoTe

Overview

Journal Sci Rep

Specialty Science

Date 2018 Dec 12

PMID 30531971

Citations 9

Authors

M Grzeszczyk

K Golasa

M R Molas

K Nogajewski

M Zinkiewicz

M Potemski

A Wysmolek

A Babinski

Affiliations

Soon will be listed here.

Abstract

We report a study of Raman scattering in few-layer MoTe focused on high-frequency out-of-plane vibrational modes near 291 cm which are associated with the bulk-inactive [Formula: see text] 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 MoTe. In accordance with literature data, the doublet's lower- and higher-energy components are ascribed to the Raman-active A/[Formula: see text] 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 MoTe Brillouin zone is proposed to be responsible for the observed effects.

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