Faculty Publications

Title

Dimensionality-driven orthorhombic MoT e2 at room temperature

Document Type

Article

Journal/Book/Conference Title

Physical Review B

Volume

97

Issue

4

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 Publication Date

1-18-2018

DOI of published version

10.1103/PhysRevB.97.041410

Repository

UNI ScholarWorks, Rod Library, University of Northern Iowa

Language

en

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