Optical evidence of type-II Weyl semimetals MoTe${}_2$ and WTe${}_2$

Abstract

The carrier dynamics and electronic structures of type-II Weyl semimetal candidates MoTe${}_2$ and WTe${}_2$ have been investigated by using temperature-dependent optical conductivity [$\sigma (\omega )$] spectra. Two kinds of Drude peaks (narrow and broad) have been separately observed. The width of the broad Drude peak increases with elevating temperature above the Debye temperature of about 130 K in the same way as those of normal metals, on the other hand, the narrow Drude peak becomes visible below 80 K and the width is rapidly suppressed with decreasing temperature. Because the temperature dependence of the narrow Drude peak is similar to that of a type-I Weyl semimetal TaAs, it was concluded to originate from Dirac carriers of Weyl bands. The result suggests that the conductance has the contribution of two kinds of carriers, normal semimetallic and Dirac carriers, and this observation is an evidence of type-II Weyl semimetals of MoTe${}_2$ and WTe${}_2$. The obtained $\sigma (\omega )$ spectra in the interband transition region can be explained by band structure calculations with a band renormalization owing to electron correlation.

arXiv comment7 pages, 6 figures

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• Role of time reversal symmetry and tilting in circular photogalvanic responses
• Tunable Low-Loss Hyperbolic Plasmon Polaritons in a T${}_d$-WTe${}_2$ Single Layer
• Nodal Semimetals: A Survey on Optical Conductivity
• Two linear regimes in optical conductivity of a Type-I Weyl semimetal: the case of elemental tellurium
• Low-energy excitations in type-II Weyl semimetal Td-MoTe2 evidenced through optical conductivity
• Optical spectroscopy and ultrafast pump-probe study of structural phase transition in 1T'-TaTe2
• Distinct signatures of particle-hole symmetry breaking in transport coefficients for generic multi-Weyl semimetals
• Evolution of the structural transition in Mo${}_{1-x}$W${}_x$Te${}_2$
• Chiral magnetic effect in lattice models of tilted multi-Weyl semimetals
• Optical conductivity of the type-II Weyl semimetal WTe${}_2$ under pressure
• Highly anisotropic Drude-weight-reduction and enhanced linear-dichroism in van der Waals Weyl semimetal Td-MoTe2 with coherent interlayer electronic transport
• Site-dependent Local Spin Susceptibility and Low-energy Excitation in a Weyl Semimetal WTe${}_2$
• Experimental nuclear quadrupole resonance and computational study of the structurally refined topological semimetal TaSb${}_2$
• Magneto-Optics of the Weyl Semimetal TaAs in the THz and IR Regions