Raman signatures of inversion symmetry breaking and structural phase transition in type-II Weyl semimetal MoTe 2
Transition metal dichalcogenide MoTe is an important candidate for realizing the newly predicted type-II Weyl 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 o...
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Published in | Nature communications Vol. 7; p. 13552 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
England
09.12.2016
|
Online Access | Get full text |
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Summary: | Transition metal dichalcogenide MoTe
is an important candidate for realizing the newly predicted type-II Weyl 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
by systematic Raman experiments and first-principles calculations. We identify five lattice vibrational modes that are Raman-active only in the low-temperature noncentrosymmetric structure. 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
phase from vibrational spectroscopy, and suggest MoTe
as an ideal candidate for investigating the temperature-induced topological phase transition. |
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ISSN: | 2041-1723 |
DOI: | 10.1038/ncomms13552 |