<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">TaIrTe</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>: A ternary type-II Weyl semimetal

Koepernik, Klaus; Kasinathan, Deepa; Efremov, D. V.; Khim, Seunghyun; Борисенко, С. В.; Büchner, B.; Brink, Jeroen van den

doi:10.1103/physrevb.93.201101

Cited by 209 publications

(172 citation statements)

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“…Recent electronic-structure calculations have predicted type-II Weyl points in TaIrTe 4 located about 79 meV above the calculated Fermi energy [25]. As the chemical potential in our crystals might be ∼ 30-40 meV above this Fermi level, the chemical potential would be just ∼ 40-50 meV below the energy of the Weyl nodes.…”

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confidence: 99%

“…To interpret the data and establish their ramifications for the electronic structure of our crystals, we compare the measured frequencies with the results of DFT based electronic-structure calculations [25]. Figure 4(a) shows the electronic band structure in the vicinity of the Fermi level.…”

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confidence: 99%

“…The presence of these very peculiar states is predicted to strongly affect magnetotransport properties of a Weyl semimetal and causes the conduction of electric current only in certain directions in presence of a magnetic field [5,20,21]. In spite of the considerable progress made by theory, only a handful of type-II Weyl semimetals have been identified on the basis of electronic band-structure calculations: WTe 2 , MoTe 2 , Ta 3 S 2 , YbMnBi 2 and, very recently, TaIrTe 4 [5,16,[22][23][24][25].Of interest is in particular the orthorhombic ternary compound TaIrTe 4 as it combines structural simplicity with topological WPs: TaIrTe 4 is a structurally layered material which hosts just four type-II WPs, the minimal number of WPs a system with time-reversal invariance can host [22]. Moreover, the WPs are well separated from each other in momentum space.…”

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Magnetotransport and de Haas–van Alphen measurements in the type-II Weyl semimetal TaIrTe4

et al. 2016

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The layered ternary compound TaIrTe4 has been predicted to be a type-II Weyl semimetal with only four Weyl points just above the Fermi energy. Performing magnetotransport measurements on this material we find that the resistivity does not saturate for fields up to 70 T and follows a ρ ∼ B 1.5 dependence. Angular-dependent de Haas-van Alphen (dHvA) measurements reveal four distinct frequencies. Analyzing these magnetic quantum oscillations by use of density functional theory (DFT) calculations we establish that in TaIrTe4 the Weyl points are located merely ∼ 40-50 meV above the chemical potential, suggesting that the chemical potential can be tuned into the four Weyl nodes by moderate chemistry or external pressure, maximizing their chiral effects on electronic and magnetotransport properties.A recent conceptual breakthrough in the theory and classification of metals is the discovery of Weyl semimetals [1][2][3]. These semimetals have a topologically nontrivial electronic structure with fermionic Weyl quasiparticles -massless chiral fermions that play as well a fundamental role in quantum field theory and high-energy physics [4]. A consequence is that in Weyl semimetals topologically protected surface states appear in the form of Fermi lines that connect Weyl points (WPs) of opposite chirality, commonly referred to as Fermi arcs.Last year it was discovered that actually two types of Weyl fermions may exist in solids [5]. Weyl semimetals of type-I have a point-like Fermi surface and consequently zero density of states at the energy of WPs [6][7][8][9][10][11][12][13][14][15][16][17][18]. This is very different from Weyl semimetals of type-II [5,19], which have thermodynamic density of states at the energy of Weyl nodes and acquire exotic Fermi surfaces: in type-II systems Weyl nodes appear at touching points between electron and hole pockets. The presence of these very peculiar states is predicted to strongly affect magnetotransport properties of a Weyl semimetal and causes the conduction of electric current only in certain directions in presence of a magnetic field [5,20,21]. In spite of the considerable progress made by theory, only a handful of type-II Weyl semimetals have been identified on the basis of electronic band-structure calculations: WTe 2 , MoTe 2 , Ta 3 S 2 , YbMnBi 2 and, very recently, TaIrTe 4 [5,16,[22][23][24][25].Of interest is in particular the orthorhombic ternary compound TaIrTe 4 as it combines structural simplicity with topological WPs: TaIrTe 4 is a structurally layered material which hosts just four type-II WPs, the minimal number of WPs a system with time-reversal invariance can host [22]. Moreover, the WPs are well separated from each other in momentum space. Such a large momentum-space separation promises a strong impact of the Weyl fermions on the transport properties. Indeed, we present in this Letter magnetotransport and magnetic quantum oscillations studies of TaIrTe 4 that evidence a non-saturating magnetoresistance signaling the presence of Weyl nodes. Analyzing de Haas-van Alp...

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Magnetotransport and de Haas–van Alphen measurements in the type-II Weyl semimetal TaIrTe4

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“…Ignited by the explicit materials prediction of overtilted (a.k.a. type-II) Weyl cones in the bandstucture of WTe 2 [15]-a material that has also before this prediction received ample attention due to its remarkable transport properties, including a record breaking magnetoresistence [20]-there is a present surge of experimental [21][22][23][24][25][26][27][28] and theoretical [29][30][31][32][33][34][35][36][37][38] studies of type-II Weyl systems.…”

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Field-Selective Anomaly and Chiral Mode Reversal in Type-II Weyl Materials

2016

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Three-dimensional condensed matter incarnations of Weyl fermions generically have a tilted dispersion-in sharp contrast with their elusive high-energy relatives where a tilt is forbidden by Lorentz invariance, and with the low-energy excitations of two-dimensional graphene sheets where a tilt is forbidden by either crystalline or particle-hole symmetry. Very recently, a number of materials (MoTe2, LaAlGe and WTe2) have been identified as hosts of so-called type-II Weyl fermions whose dispersion is so strongly tilted that a Fermi surface is formed, whereby the Weyl node becomes a singular point connecting electron and hole pockets. We here predict that these systems have remarkable properties in presence of magnetic fields. Most saliently, we show that the nature of the chiral anomaly depends crucially on the relative angle between the applied field and the tilt, and that an inversion-asymmetric overtilting creates an imbalance in the number of chiral modes with positive and negative slopes. The field-selective anomaly gives a novel magneto-optical resonance, providing an experimental way to detect concealed Weyl nodes. [6,7], and have by now been confirmed to exist as quasi-particles in a rapidly growing list of materials displaying remarkable properties including topological Fermi arc surface states [4, 6-8] and a condensed matter incarnation of the chiral anomaly when exposed to external electromagnetic fields [9][10][11][12].The Weyl Hamiltonian pertinent to condensed matter,

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

Liu

et al. 2018

Advanced Materials

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The layered ternary compound TaIrTe 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 TaIrTe is established using angle-resolved polarized Raman spectroscopy. Combining with high-resolution transmission electron microscopy, an efficient and nondestructive recipe to determine the exact crystallographic orientation of TaIrTe crystals is demonstrated. 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 TaIrTe thin flakes is also revealed, up to 200% at 10 K, 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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TaIrTe4: A ternary type-II Weyl semimetal

Cited by 209 publications

References 27 publications

Magnetotransport and de Haas–van Alphen measurements in the type-II Weyl semimetal TaIrTe4

Magnetotransport and de Haas–van Alphen measurements in the type-II Weyl semimetal TaIrTe4

Field-Selective Anomaly and Chiral Mode Reversal in Type-II Weyl Materials

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

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TaIrTe4: A ternary type-II Weyl semimetal

Cited by 209 publications

References 27 publications

Magnetotransport and de Haas–van Alphen measurements in the type-II Weyl semimetal TaIrTe4

Magnetotransport and de Haas–van Alphen measurements in the type-II Weyl semimetal TaIrTe4

Field-Selective Anomaly and Chiral Mode Reversal in Type-II Weyl Materials

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

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