A type of robust superlattice type-I Weyl semimetal with four Weyl nodes

Meng, Lijun; Wu, Jiafang; Zhong, Jianxin; Römer, Rudolf A.

doi:10.1039/c9nr04551a

Cited by 14 publications

(5 citation statements)

References 35 publications

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“…Weyl points with different chiral appear at different momentum positions, and their projections on the surface are connected by the Fermi arc. Because the emergence of WSM needs to break the time reversal symmetry or space inversion symmetry, and in IH and FH, inversion symmetry is naturally broken, so many Heusler compounds are Weyl semimetals, such as LnPtBi (Ln=Y, Gd, or Nd) [22] , WTeS and WTeSe [23], LaAlGe [24], and Co2TiX (X=Si, Ge, or Sn) [25] in FH. The time reversal symmetry of magnetic WSM is guaranteed by the system magnetism and can be controlled by the external field.…”

Section: 4magnetic Structurementioning

confidence: 99%

Progress Review on Topological Properties of Heusler Materials

Lin

2020

E3S Web Conf.

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Starting from crystal, electronic and magnetic structures of Heusler compounds, this paper studies the new topological materials related to Heusler compounds and their topological properties, such as anomalous Hall effect, skyrmions, chiral anomaly, Dirac fermion, Weyl fermion, transverse Nernst thermoelectric effect, thermal spintronics and topological surface states. It can be discovered that the topological state of Heusler compound can be well protected due to its high symmetry, thus producing rich topological properties. Heusler materials belonged to Weyl semimetals usually have strong anomalous Hall effect, and the Heusler materials with doping or Anomalous Nernst Effect (ANE) usually have higher thermoelectric figure of merit. These anomalous effects are closely related to the strong spin–orbit interaction. In application, people can use the non-dissipative edge state of quantum anomalous Hall effect to develop a new generation of low-energy transistors and electronic devices. The conversion efficiency of thermoelectric materials can be improved by ANE, and topological superconductivity can be used to promote the progress of quantum computation.

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Section: 4magnetic Structurementioning

confidence: 99%

Progress Review on Topological Properties of Heusler Materials

Lin

2020

E3S Web Conf.

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“…The Dirac and Weyl fermions exhibit massless nature and behave in a fundamentally different manner from that of conventional Schro ¨dinger fermions. [5][6][7][8] Furthermore, it is responsible for the realization of specific properties in TSMs such as Fermi arcs, drumhead surface states, chiral anomaly and extreme magnetoresistance. [9][10][11][12][13] As a result, TSMs have become a focus of scientific investigation in the fields of solid-state chemistry, condensed matter physics and materials science.…”

Section: Introductionmentioning

confidence: 99%

A nodal flexible-surface three-dimensional carbon network with potential applications as a lithium-ion battery anode material

Nulakani,

Bandyopadhyay,

Ali

2024

J. Mater. Chem. C

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“…According to the Nielsen-Ninomiya theorem [29], each pair of nodes carries Berry curvature monopoles of opposite chirality which are connected via Fermi arcs lying at opposite sur-faces of the slab [30]. Type I WSMs, such as elemental Tellurium [31], Janus superlattices [32] and Ta or As compounds [33][34][35], are characterized by point-like Fermi surface in the bulk and vanishing density of states. Type II WSMs, such as MoTe 2 [36,37] and WTe 2 [38,39] but also the magnetic candidate Co 3 Sn 2 S 2 [40][41][42][43][44][45], offer a slightly different paradigm as the Weyl cone spectrum is tilted in momentum space, breaking Lorentz invariance.…”

Section: Introductionmentioning

confidence: 99%

Influence of the surface states on the nonlinear Hall effect in Weyl semimetals

Ovalle¹,

Pezo²,

Manchon³

2022

Preprint

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We investigate the influence of surface states on the nonlinear Hall response of noncentrosymmetric time-reversal invariant Weyl semimetals. To do so, we perform a tomography of the Berry curvature dipole in a slab system using a minimal two-band model. We find that in the type-I phase, the nonlinear Hall response is not particularly sensitive to the presence of Fermi arcs or other trivial surface states. However, in the type-II phase, we find that these surface states contribute substantially to the Berry curvature dipole, leading to a strong thickness dependence of the nonlinear Hall response. This feature depends on the nature of the surface states and, henceforth, on the slab geometry adopted. In order to assess the validity of this scenario for realistic systems, we performed Berry curvature dipole calculations by first principles on the WTe2, confirming the dramatic impact of surface states for selected slab geometries. Our results suggest that surface states, being topological or not, can contribute much more efficiently to the nonlinear Hall response than bulk states. This prediction is not limited to topological semimetals and should apply to topologically trivial non-centrosymmetric materials and heterostructures, paving the way to interfacial engineering of the nonlinear Hall effect.

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A type of robust superlattice type-I Weyl semimetal with four Weyl nodes

Abstract: We investigate the topological properties of the Janus superlattices WTeS and WTeSe by first-principles methods and Wannier-based tight-binding Hamiltonians.

Cited by 14 publications

References 35 publications

Progress Review on Topological Properties of Heusler Materials

Progress Review on Topological Properties of Heusler Materials

A nodal flexible-surface three-dimensional carbon network with potential applications as a lithium-ion battery anode material

Influence of the surface states on the nonlinear Hall effect in Weyl semimetals

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