Experimental Observation of Anisotropic Adler-Bell-Jackiw Anomaly in Type-II Weyl Semimetal 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>WTe</mml:mi></mml:mrow><mml:mrow><mml:mn>1.98</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
 Crystals at the Quasiclassical Regime

Lv, Yang‐Yang; Xiao, Li; Zhang, Bin-Bin; Deng, Weiyin; Yao, Shu‐Hua; Chen, Y. B.; Zhou, Jian; Zhang, Shan‐Tao; Lu, M.; Zhang, Lei; Tian, Mingliang; Sheng, L.; Chen, Yanfeng

doi:10.1103/physrevlett.118.096603

Cited by 124 publications

(97 citation statements)

References 45 publications

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“…(Color online) Comparison between the conductivities σ tilt /σ0 and σperp/σ0 of the tilted graphene in terms of the tilt parameter for energies at z = 1, 5, and 10. Conductivity calculated from the Kubo formula (dashed) agree with the covariant Boltzmann approach (solid) in(31), and(30). While the perpendicular conductivity diverges in critical limit, the conductivity parallel to tilt direction saturates at finite value.…”

mentioning

confidence: 73%

“…Figure 2 shows a comparison between the conductivities (47) and (48) obtained from the Kubo approach (dashed lines) and those from the covariant Boltzmann formula, Eqs. (31) and (30). The only difference resides in the offset of δσ = σ 0 /4z = σ 0 /8ετ , which is due to the quantum corrections that are neglected in the latter approach.…”

Section: B Kubo Formulamentioning

confidence: 96%

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Large enhancement of conductivity in Weyl semimetals with tilted cones: Pseudorelativity and linear response

2019

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We study the conductivity of two-dimensional graphene-type materials with tilted cones as well as their three-dimensional Weyl counterparts and show that a covariant quantum Boltzmann equation is capable of providing an accurate description of these materials' transport properties. The validity of the covariant Boltzmann approach is corroborated by calculations within the Kubo formula. We find a strong anisotropy in the conductivities parallel and perpendicular to the tilt direction upon an increase of the tilt parameter η, which can be interpreted as the boost parameter of a Lorentz transformation. While the ratio between the two conductivities is 1 − η 2 in the twodimensional case where only the conductivity perpendicular to the tilt direction diverges for η → 1, both conductivities diverge in three-dimensional Weyl semimetals, where η = 1 separates a type-I (for η < 1) from a type-II Weyl semimetal (for η > 1).

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mentioning

confidence: 73%

Section: B Kubo Formulamentioning

confidence: 96%

Large enhancement of conductivity in Weyl semimetals with tilted cones: Pseudorelativity and linear response

2019

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“…Negative MR can be observed for θ ≤ 30 • at 2 K (Fig 3a), and at T ≤ 70 K for θ = 0 • (Fig 3b). The negative MR can be analysed using the semiclassical formula 18,24,32 ,…”

Section: Negative Longitudinal Mr and Chiral Anomalymentioning

confidence: 99%

Evidence for a Dirac nodal-line semimetal in SrAs3

Guo

et al. 2018

Science Bulletin

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Dirac nodal-line semimetals with the linear bands crossing along a line or loop, represent a new topological state of matter. Here, by carrying out magnetotransport measurements and performing first-principle calculations, we demonstrate that such a state has been realized in highquality single crystals of SrAs 3 . We obtain the nontrivial π Berry phase by analysing the Shubnikov-de Haas quantum oscillations. We also observe a robust negative longitudinal magnetoresistance induced by the chiral anomaly. Accompanying first-principles calculations identify that a single hole pocket enclosing the loop nodes is responsible for these observations.

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“…Many unique transport characteristics have been predicted for the Weyl band structures in general and the Fermi arc states in particular. [44][45][46][47][48][49][50][51] Transport experiments on Weyl semimetals have indeed seen several intriguing features; 17,[52][53][54][55][56][57][58][59][60] however, the link to the Weyl band structure is often difficult to make. To clarify this connection, it would be ideal to use a system where Weyl behavior can be switched on and off using an experimentally tunable parameter like temperature, pressure or applied field.…”

Section: Introductionmentioning

confidence: 99%

Temperature-driven topological transition in 1T'-MoTe2

et al. 2018

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The topology of Weyl semimetals requires the existence of unique surface states. Surface states have been visualized in spectroscopy measurements, but their connection to the topological character of the material remains largely unexplored. 1T'-MoTe 2 , presents a unique opportunity to study this connection. This material undergoes a phase transition at 240 K that changes the structure from orthorhombic (putative Weyl semimetal) to monoclinic (trivial metal), while largely maintaining its bulk electronic structure. Here, we show from temperature-dependent quasiparticle interference measurements that this structural transition also acts as a topological switch for surface states in 1T'-MoTe 2 . At low temperature, we observe strong quasiparticle scattering, consistent with theoretical predictions and photoemission measurements for the surface states in this material. In contrast, measurements performed at room temperature show the complete absence of the scattering wavevectors associated with the trivial surface states. These distinct quasiparticle scattering behaviors show that 1T'-MoTe 2 is ideal for separating topological and trivial electronic phenomena via temperature-dependent measurements.

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Experimental Observation of Anisotropic Adler-Bell-Jackiw Anomaly in Type-II Weyl Semimetal WTe1.98 Crystals at the Quasiclassical Regime

Cited by 124 publications

References 45 publications

Large enhancement of conductivity in Weyl semimetals with tilted cones: Pseudorelativity and linear response

Large enhancement of conductivity in Weyl semimetals with tilted cones: Pseudorelativity and linear response

Evidence for a Dirac nodal-line semimetal in SrAs3

Temperature-driven topological transition in 1T'-MoTe2

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