Dimensionality-driven orthorhombic MoT e2 at room temperature
Physical Review B
We use a combination of Raman spectroscopy and transport measurements to study thin flakes of the type-II Weyl semimetal candidate MoTe2 protected from oxidation. In contrast to bulk crystals, which undergo a phase transition from monoclinic to the inversion symmetry breaking, orthorhombic phase below ∼250K, we find that in moderately thin samples below ∼12nm, a single orthorhombic phase exists up to and beyond room temperature. This could be due to the effect of c-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 MoTe2 at room temperature.
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UNI ScholarWorks, Rod Library, University of Northern Iowa
He, Rui; Zhong, Shazhou; Kim, Hyun Ho; Ye, Gaihua; Ye, Zhipeng; Winford, Logan; McHaffie, Daniel; Rilak, Ivana; Chen, Fangchu; Luo, Xuan; Sun, Yuping; and Tsen, Adam W., "Dimensionality-driven orthorhombic MoT e2 at room temperature" (2018). Faculty Publications. 752.