Raman scattering in transition metal dichalcogenides MTe2 (M = Mo, W)

Abstract

We performed comparable polarized Raman scattering studies of MoTe2 and WTe2. By rotating crystals to tune the angle between the principal axis of the crystals and the polarization of the incident/scattered light, we obtained the angle dependence of the intensities for all the observed modes, which is perfectly consistent with careful symmetry analysis. Combining these results with first-principles calculations, we clearly identified the observed phonon modes in the different phases of both crystals. Fifteen Raman-active phonon modes (10Ag+5Bg) in the high-symmetry phase 1T'-MoTe2 (300 K) were well assigned, and all the symmetry-allowed Raman modes (11A1+6A2) in the low-symmetry phase Td-MoTe2 (10 K) and 12 Raman phonons (8A1+4A2) in Td-WTe2 were observed and identified. The present work provides basic information about the lattice dynamics in transition-metal dichalcogenides and may shed some light on the understanding of the extremely large magnetoresistance (MR) in this class of materials.

arXiv comment16 pages, 4 figures, 1 table, 47 references

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Cited by in corpus (22)

• Evolution of Raman spectra in Mo${}_{1-x}$W${}_x$Te${}_2$ alloys
• Phase evolution and superconductivity enhancement in Se-substituted MoTe${}_2$ thin films
• Enhanced ultrafast relaxation rate in the Weyl semimetal phase of $\mathbf{MoT}{\mathbf{e}}_2$ measured by time-and angle-resolved photoelectron spectroscopy
• Experimental Progress on Layered Topological Semimetals
• Probing lattice dynamics and electron-phonon coupling in topological nodal-line semimetal ZrSiS
• Ultrafast dynamics of the low frequency shear mode in $1{\mathrm{T}}^{\prime }-\mathrm{MoT}{\mathrm{e}}_2$
• Efficient method for calculating Raman spectra of solids with impurities and alloys and its application to two-dimensional transition metal dichalcogenides
• Topological phase transition between distinctWeyl semimetal states in MoTe2
• Low-energy excitations in type-II Weyl semimetal Td-MoTe2 evidenced through optical conductivity
• Thickness dependent transition from the 1T${}^{\prime }$ to Weyl semimetal phase in ultrathin MoTe${}_2$: Electrical transport, Noise and Raman studies
• Photo-induced Tellurium segregation in $\mathrm{MoT}{\mathrm{e}}_2$
• Topological phase transition in MoTe${}_2$: A Review
• Raman spectrum of 1T'-WTe2 under tensile strain: A first-principles prediction
• Polarization-resolved broadband time-resolved optical spectroscopy for complex materials: application to the case of MoTe${}_2$ polytypes
• Lattice dynamics of topological Dirac semimetal LaAgSb${}_2$ with charge density wave ordering
• Unidirectional Alignment of AgCN Microwires on Distorted Transition Metal Dichalcogenide Crystals
• Dimensionality-dependent type-II Weyl semimetal state in Mo${}_{0.25}$W${}_{0.75}$Te${}_2$
• Analysis methodology of coherent oscillations in time- and angle-resolved photoemission spectroscopy
• Raman Digital Twin of Monolayer Janus Transition Metal Dichalcogenides
• Large change of interlayer vibrational coupling with stacking in Mo${}_{1-x}$W${}_x$Te${}_2$
• Controlled synthesis of MoxW1-xTe2 atomic layers with emergent quantum states
• Coherent Phonon-Driven Band Renormalizations in 1T${}^{\prime }$-MoTe${}_2$