Dimensionality-driven orthorhombic MoTe2 at room temperature

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 ~250 K, we find that in moderately thin samples below ~12 nm, 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.

References in corpus (25)

• Atomically thin MoS2: A new direct-gap semiconductor
• 2D materials and van der Waals heterostructures
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Cited by in corpus (26)

• Transport evidence of asymmetric spin-orbit coupling in few$-$layer superconducting 1Td$-$MoTe${}_2$
• Layer-dependent spin-orbit torques generated by the centrosymmetric transition metal dichalcogenide $\beta$-MoTe${}_2$
• Engineering Weyl phases and nonlinear Hall effects in T${}_d$-MoTe${}_2$
• Structural Phase Transition and Interlayer Coupling in Few-Layer 1T' and Td MoTe2
• Phase evolution and superconductivity enhancement in Se-substituted MoTe${}_2$ thin films
• Tailoring the Phase Transition and Electron-Phonon Coupling in 1T'-MoTe2 by Charge Doping: A Raman Study
• Experimental Progress on Layered Topological Semimetals
• Unconventional charge-to-spin conversions in graphene/MoTe2 van der Waals heterostructures
• Ultrafast dynamics of the low frequency shear mode in $1{\mathrm{T}}^{\prime }-\mathrm{MoT}{\mathrm{e}}_2$
• T${}_d$ to 1T${}^{\prime }$ structural phase transition in WTe${}_2$ Weyl semimetal
• Spin-resolved electronic response to the phase transition in MoTe${}_2$
• Origin of magnetoresistance suppression in thin $\gamma$-MoTe${}_2$
• Thickness dependent transition from the 1T${}^{\prime }$ to Weyl semimetal phase in ultrathin MoTe${}_2$: Electrical transport, Noise and Raman studies
• Barkhausen effect in the first order structural phase transition in type-II Weyl semimetal MoTe2
• Persistence of Monoclinic Crystal Structure in Three-Dimensional Second-Order Topological Insulator Candidate 1T'-MoTe2 Thin Flake without Structural Phase transition
• Evolution of the structural transition in Mo${}_{1-x}$W${}_x$Te${}_2$
• Topological phase transition in MoTe${}_2$: A Review
• Enhanced Superconductivity in Monolayer $T_d$-MoTe${}_2$ with Tilted Ising Spin Texture
• Generation and detection of coherent longitudinal acoustic waves in ultrathin 1T'-MoTe2
• Antiferromagnetic-ferromagnetic homostructures with Dirac magnons in van der Waals magnet CrI${}_3$
• Superconducting pairing symmetry in MoTe${}_2$
• Photoinduced Interlayer Dynamics in T${}_d$-MoTe${}_2$: A Broadband Pump-Probe Study
• Giant anisotropic magnetoresistance in few-layer α-RuCl3 tunnel junctions
• Nonlinear magnetotransport in MoTe${}_2$
• Large change of interlayer vibrational coupling with stacking in Mo${}_{1-x}$W${}_x$Te${}_2$
• Direct observation of distinct bulk and edge nonequilibrium spin accumulation in ultrathin MoTe${}_2$