Abstract
We use a combination of Raman spectroscopy and transport measurements to study thin flakes of the type-II Weyl semimetal candidate protected from oxidation. In contrast to bulk crystals, which undergo a phase transition from monoclinic to the inversion symmetry breaking, orthorhombic phase below , we find that in moderately thin samples below , a single orthorhombic phase exists up to and beyond room temperature. This could be due to the effect of -axis confinement, which lowers the energy of an out-of-plane hole band and stabilizes the orthorhombic structure. Our results suggest that Weyl nodes, predicated upon inversion symmetry breaking, may be observed in thin at room temperature.
- Received 15 July 2017
- Revised 25 October 2017
DOI:https://doi.org/10.1103/PhysRevB.97.041410
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