Raman signatures of inversion symmetry breaking and structural phase transition in type-II Weyl semimetal MoTe2

Abstract

Transition metal dichalcogenide MoTe${}_2$ is an important candidate for realizing the newly predicted type-IIWeyl fermions, for which the breaking of the inversion symmetry is a prerequisite. Here we present direct spectroscopic evidence for the inversion symmetry breaking in the low temperature phase of MoTe${}_2$ by systematic Raman experiments and first principles calculations. We identify five lattice vibrational modes which are Raman active only in noncentrosymmetric structure at low temperature. A hysteresis is also observed in the peak intensity of inversion symmetry activated Raman modes, confirming a temperature induced structural phase transition with a concomitant change in the inversion symmetry. Our results provide definitive evidence for the low temperature noncentrosymmetric T${}_d$ phase from vibrational spectroscopy, and suggest MoTe${}_2$ as an ideal candidate for investigating the temperature induced topological phase transition.

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Cited by in corpus (56)

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• Manipulating Weyl quasiparticles by orbital-selective photoexcitation in WTe2
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• Tailoring the Phase Transition and Electron-Phonon Coupling in 1T'-MoTe2 by Charge Doping: A Raman Study
• Experimental Progress on Layered Topological Semimetals
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• Ultrafast dynamics of the low frequency shear mode in $1{\mathrm{T}}^{\prime }-\mathrm{MoT}{\mathrm{e}}_2$
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• In situ Imaging of an Anisotropic Layer-by-Layer Phase Transition in Few-Layer MoTe2
• Topological phase transition between distinctWeyl semimetal states in MoTe2
• Low-energy excitations in type-II Weyl semimetal Td-MoTe2 evidenced through optical conductivity
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• Strong and Tunable Electrical-Anisotropy in Type-II Weyl Semimetal Candidate WP2 with Broken Inversion Symmetry
• Superconducting properties of MoTe${}_2$ from the $abinitio$ anisotropic Migdal-Eliashberg theory
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• Electronic structure of molecular beam epitaxy grown 1T${}^{\prime }$-MoTe${}_2$ film and strain effect
• Harnessing physical entropy noise in structurally metastable 1T' molybdenum ditelluride for true random number generation
• Polarization-resolved broadband time-resolved optical spectroscopy for complex materials: application to the case of MoTe${}_2$ polytypes
• Magnetic field-induced type-II Weylsemimetallic state in geometrically frustrated Shastry-Sutherland lattice GdB4
• Reconsidering the nonlinear emergent inductance: time-varying Joule heating and its impact on the AC electrical response
• Photoinduced Interlayer Dynamics in T${}_d$-MoTe${}_2$: A Broadband Pump-Probe Study
• Unidirectional Alignment of AgCN Microwires on Distorted Transition Metal Dichalcogenide Crystals
• Out-of-plane spin-to-charge conversion at low temperatures in graphene/MoTe${}_2$ heterostructures
• Centrosymmetric-noncentrosymmetric Structural Phase Transition in Quasi one-dimensional compound, (TaSe${}_4$)${}_3$I
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• Nonlinear magnetotransport in MoTe${}_2$
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• Large change of interlayer vibrational coupling with stacking in Mo${}_{1-x}$W${}_x$Te${}_2$
• Third-order nonlinear transport in a percolative two-dimensional superconductor
• Coherent Phonon-Driven Band Renormalizations in 1T${}^{\prime }$-MoTe${}_2$
• Kramers nodal line in the charge density wave state of YTe${}_3$ and the influence of twin domains