Dimensionality-driven orthorhombic MoT e2 at room temperature

Rui He, Shazhou Zhong, Hyun Ho Kim, Gaihua Ye, Zhipeng Ye, Logan Winford, Daniel McHaffie, Ivana Rilak, Fangchu Chen, Xuan Luo, Yuping Sun, Adam W. Tsen

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

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.

Original languageEnglish
Article number041410
JournalPhysical Review B
Volume97
Issue number4
DOIs
StatePublished - Jan 18 2018

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