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Type-II Weyl fermion nodes, located at the touching points between electronand hole pockets, have been recently predicted to occur in distorted octahedral($T'$) transition metal dichalcogenide semimetals, contingent upon thecondition that the layered crystal has the noncentrosymmetric orthorhombic($T'_{or}$) stacking. Here, we report on the emergence of two shear Raman bandsactivated by inversion symmetry breaking in $T'$-MoTe$_2$ due to samplecooling. Polarization and crystal orientation resolved measurements furtherpoint to a phase transition from the monoclinic ($T'_{mo}$) structure to thedesired $T'_{or}$ lattice. These results provide spectroscopic evidence thatlow-temperature $T'$-MoTe$_2$ is suitable for probing type-II Weyl physics.

Inversion-symmetry-breaking-activated shear Raman bands in $T'$-MoTe$_2$