Magnetic Weyl semimetal phase in a Kagomé crystal

Liu, D. F.; Liang, Aiji; Liu, E. K.; Xu, Qiunan; Li, Y. W.; Chen, C.; Pei, Ding; Shi, Wujun; Mo, S.-K.; Dudin, Pavel; Kim, T. K.; Cacho, Céphise; Li, Gang; Sun, Yan; Yang, Lexian; Liu, Z. K.; Parkin, Stuart S. P.; Felser, Claudia; Chen, Y. L.

doi:10.1126/science.aav2873

Cited by 626 publications

(405 citation statements)

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“…Magnetic Weyl semimetal. Co 3 Sn 2 S 2 , a Co-based shandite material, is a ferromagnetic metal with the Curie temperature T C of~175 K 7,8,20,21,[29][30][31] . The crystal structure has a hexagonal lattice belonging to the space group R 3m with forming a kagome network of Co atoms within the Co 3 Sn layer (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The intrinsic AH conductivity and AH angle are particularly enhanced by tuning the Fermi level to the (anti-)crossing point in the electronic band structure with Berry curvature 10 . Accordingly, the topological materials with nontrivial crossing points near their Fermi levels are attracting much attention as the ideal platforms for exploring the large AHE, accelerating the extensive material research [11][12][13][14][15][16][17][18][19][20][21] . One important advance is the recent discovery of the Weyl semimetal (WSM) possessing pairs of nondegenerate crossing points, i.e., Weyl points 1,[14][15][16][17]20 .…”

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confidence: 99%

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Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

et al. 2020

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The Weyl semimetal (WSM), which hosts pairs of Weyl points and accompanying Berry curvature in momentum space near Fermi level, is expected to exhibit novel electromagnetic phenomena. Although the large optical/electronic responses such as nonlinear optical effects and intrinsic anomalous Hall effect (AHE) have recently been demonstrated indeed, the conclusive evidence for their topological origins has remained elusive. Here, we report the gigantic magneto-optical (MO) response arising from the topological electronic structure with intense Berry curvature in magnetic WSM Co3Sn2S2. The low-energy MO spectroscopy and the first-principles calculation reveal that the interband transitions on the nodal rings connected to the Weyl points show the resonance of the optical Hall conductivity and give rise to the giant intrinsic AHE in dc limit. The terahertz Faraday and infrared Kerr rotations are found to be remarkably enhanced by these resonances with topological electronic structures, demonstrating the novel low-energy optical response inherent to the magnetic WSM.

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Section: Resultsmentioning

confidence: 99%

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Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

et al. 2020

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“…13 The layered Shandite compound Co3Sn2S2 is one of the very few known magnetic Weyl semimetals. [14][15][16] Apart from its interesting topological properties, this compound is also investigated for its thermoelectric properties and possible skyrmionic phase. 17 The topological effect evoked by the Weyl points is responsible for the giant anomalous Hall effect in this compound.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic Anomalous Hall Effect in Ni-Substituted Magnetic Weyl Semimetal Co₃Sn₂S₂

Thakur¹,

Vir²,

Guin³

et al. 2020

Chem. Mater.

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Topological materials have recently attracted considerable attention among materials scientists as their properties are predicted to be protected against perturbations such as lattice distortion and chemical substitution. However, any experimental proof of such robustness is still lacking. In this study, we experimentally demonstrate that the topological properties of the ferromagnetic kagomé compound Co3Sn2S2 are preserved upon Ni substitution. We systematically vary the Ni content in Co3Sn2S2 single crystals and study their magnetic and anomalous transport properties. For the intermediate Ni substitution, we observe a remarkable increase in the coercive field while still maintaining significant anomalous Hall conductivity. The large anomalous Hall conductivity of these compounds is intrinsic, consistent with first-principle calculations, which proves its topological origin. Our results can guide further studies on the chemical tuning of topological materials for better understanding.

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“…The successful detection of Weyl fermions in TaAs [24], following theoretical prediction of the same [11,53], marks one of the latest milestones in the study of topological phases of matter, currently the most active frontier in Condensed Matter Physics [1,2,19,20,46,51,52,56,57]. [1,51,52,56] or inversion symmetry [46,57] or both [6].…”

Section: Introductionmentioning

confidence: 99%

Weyl-triplons in SrCu2(BO3)2

Sengupta

Bhowmick

2020

Preprint

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Presence of Weyl node, nodal line or nodal surface in the band structure is a signature of topological gapless phase in a three-dimensional(3D) material. Here, we propose that Weyl triplons are expected to appear in the low energy magnetic excitations in the canonical Shastry-Sutherland compound, \ce{SrCu2(BO3)2}, a quasi-2D quantum magnet. Our results show that whena minimal, realistic inter-layer coupling is added to the well-established microscopicmodel describing the excitation spectrum of the individual layers,the Dirac points that appears in the zero-field triplon spectrum of the 2D modelsplits into two pairs of Weyl points along the Kz direction. Varying the strength of the inter-layer Dzyaloshinskii–Moriya(DM) interaction and applying asmall longitudinal magnetic field results in a range of band topologytransitions accompanied by changing numbers of Weyl points. We propose inelastic neutron scattering along with thermal Hall effect as the experimental techniques to detect the presence of Weyl-node in the triplon spectrum of this material.

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Magnetic Weyl semimetal phase in a Kagomé crystal

Cited by 626 publications

References 55 publications

Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

Intrinsic Anomalous Hall Effect in Ni-Substituted Magnetic Weyl Semimetal Co₃Sn₂S₂

Weyl-triplons in SrCu2(BO3)2

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Magnetic Weyl semimetal phase in a Kagomé crystal

Cited by 626 publications

References 55 publications

Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

Giant magneto-optical responses in magnetic Weyl semimetal Co3Sn2S2

Intrinsic Anomalous Hall Effect in Ni-Substituted Magnetic Weyl Semimetal Co3Sn2S2

Weyl-triplons in SrCu2(BO3)2

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Intrinsic Anomalous Hall Effect in Ni-Substituted Magnetic Weyl Semimetal Co₃Sn₂S₂