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.

16 pages, 4 figures, 1 table, 47 references

References in corpus (8)

• Titanic Magnetoresistance in WTe2
• Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
• Electronic structure basis for the titanic magnetoresistance in WTe${}_2$
• Quantum oscillations, thermoelectric coefficients and the Fermi surface of semi-metallic WTe2
• Anisotropic giant magnetoresistance in NbSb2
• Electron scattering in tantalum monoarsenide
• Double resonance Raman modes in mono- and few-layer MoTe${}_2$
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Cited by in corpus (13)

• 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
• 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
• Topological phase transition in MoTe${}_2$: A Review
• Raman spectrum of 1T'-WTe2 under tensile strain: A first-principles prediction
• Unidirectional Alignment of AgCN Microwires on Distorted Transition Metal Dichalcogenide Crystals
• Analysis methodology of coherent oscillations in time- and angle-resolved photoemission spectroscopy
• Raman Digital Twin of Monolayer Janus Transition Metal Dichalcogenides
• Controlled synthesis of MoxW1-xTe2 atomic layers with emergent quantum states
• Coherent Phonon-Driven Band Renormalizations in 1T${}^{\prime }$-MoTe${}_2$