Raman Signatures of Broken Inversion Symmetry and In-plane Anisotropy in Type-II Weyl Semimetal Candidate TaIrTe4

Abstract

The layered ternary compound TaIrTe4 is an important candidate to host the recently predicted type-II Weyl Fermions. However, a direct and definitive proof of the absence of inversion symmetry in this material, a prerequisite for the existence of Weyl Fermions, has so far remained evasive. Herein, an unambiguous identification of the broken inversion symmetry in TaIrTe4 is established using angle-resolved polarized Raman spectroscopy. Combining with high-resolution transmission electron microscopy, we demonstrate an efficient and nondestructive recipe to determine the exact crystallographic orientation of TaIrTe4 crystals. Such technique could be extended to the fast identification and characterization of other type-II Weyl Fermions candidates. A surprisingly strong in-plane electrical anisotropy in TaIrTe4 thin flakes is also revealed, up to 200% at 10K, which is the strongest known electrical anisotropy for materials with comparable carrier density, notably in such good metals as copper and silver.

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Cited by in corpus (18)

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• Room temperature nonlinear Hall effect and wireless RF rectification in Weyl semimetal TaIrTe4
• Gate tunable giant anisotropic resistance in ultra-thin GaTe
• Observation of the dual quantum spin Hall insulator by density-tuned correlations in a van der Waals monolayer
• Experimental Progress on Layered Topological Semimetals
• Quantum spin Hall effect in monolayer and bilayer TaIrTe${}_4$
• Observation of superconductivity in pressurized Weyl semimetal candidate TaIrTe4
• Visualizing bulk and edge photocurrent flow in anisotropic Weyl semimetals
• Strong and Tunable Electrical-Anisotropy in Type-II Weyl Semimetal Candidate WP2 with Broken Inversion Symmetry
• Anomalous Phonon-mode Dependence in Polarized Raman Spectroscopy of Topological Weyl Semimetal TaP
• Barkhausen effect in the first order structural phase transition in type-II Weyl semimetal MoTe2
• First-principles calculations of double resonance Raman spectra for monolayer MoTe${}_2$
• Room-temperature van der Waals magnetoresistive memories with data writing by orbital current in the Weyl semimetal TaIrTe4
• Orbital anomalous Hall effect in the few-layer Weyl semimetal TaIrTe4
• Observation of nearly identical superconducting transition temperatures in pressurized Weyl semimetal MIrTe4 (M=Nb and Ta)
• Kramers nodal line in the charge density wave state of YTe${}_3$ and the influence of twin domains
• Large Transverse Thermoelectric Effect in Weyl Semimetal TaIrTe${}_4$ Engineered for Photodetection
• A Raman Probe of Phonons and Electron-phonon Interactions in NbIrTe4