Magnetic exchange induced Weyl state in a semimetal EuCd2Sb2

Su, Hao; Gong, Ben-Chao; Shi, Wujun; Yang, Haifeng; Wang, Hongyuan; Xia, Wei; Yu, Zhenhai; Guo, Peng‐Jie; Wang, Jinhua; Ding, Linchao; Xu, Liangcai; Li, Xiaokang; Wang, Xia; Zou, Zhiqiang; Yu, Na; Zhu, Zengwei; Chen, Yulin; Liu, Zhongkai; Li, Kai; Li, Gang; Guo, Yanfeng

doi:10.1063/1.5129467

Cited by 52 publications

(38 citation statements)

References 71 publications

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“…We are confident that the conductance scaling uncovered in this work can be observed in experiment, considering the recent efforts in manufacturing microstructured Weyl semimetals [38], creating strain-induced fields in type-II Weyl semimetals [39], and transport experiments in Dirac nanowires [40,41]. As our results rely on time-reversal symmetry-breaking materials, magneticexchange induced Weyl semimetals [42,43] are promising platforms for experiments. We have uncovered the conditions necessary to observe the unusual scaling of the conductivity: The sample's width needs to be larger than the magnetic length, and the sample's length in transport direction needs to be larger than the mean free path.…”

supporting

confidence: 59%

Anomalous conductance scaling in strained Weyl semimetals

Behrends

Ilan

Bardarson

2019

Phys. Rev. Research

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Magnetotransport provides key experimental signatures in Weyl semimetals. The longitudinal magnetoresistance is linked to the chiral anomaly, and the transversal magnetoresistance to the dominant charge relaxation mechanism. Axial magnetic fields that act with opposite sign on opposite chiralities facilitate new transport experiments that probe the low-energy Weyl nodes. As recently realized, these axial fields can be achieved by straining samples or adding inhomogeneities to them. Here, we identify a robust signature of axial magnetic fields: an anomalous scaling of the conductance in the diffusive ultraquantum regime. In particular, we demonstrate that the longitudinal conductivity in the ultraquantum regime of a disordered Weyl semimetal subjected to an axial magnetic field increases with both the field strength and sample width due to a spatial separation of charge carriers. We contrast axial magnetic with real magnetic fields to clearly distinguish the different behavior of the conductance. Our results rely on numerical tight-binding simulations and are supported by analytical arguments. We argue that the spatial separation of charge carriers can be used for directed currents in microstructured electronic devices. arXiv:1906.08277v1 [cond-mat.mes-hall]

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supporting

confidence: 59%

Anomalous conductance scaling in strained Weyl semimetals

Behrends

Ilan

Bardarson

2019

Phys. Rev. Research

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“…Other candidate materials to observe this effect include ferromagnetic Weyl semimetals which have been recently identified experimentally [11][12][13][17][18][19][20] and are also captured by our theory. Specifically, we consider EuCd 2 As 2 , whose ground state is an itinerant magnet where Eu ions form ferromagnetic layers stacked antiferromagnetically along the c-axis.…”

Section: Introduction-mentioning

confidence: 60%

“…The M(r) · b term breaks the TR symmetry, and M(r) = M (r)(sin θ(r) cos φ(r), sin θ(r) sin φ(r), cos θ(r)) corresponds to 3-dimensional (3d) magnetization or any field that transforms as magnetization under TR. It can be used to describe real materials such as 3d topological insulators (TI) with magnetic texture [14], topological insulator heterostructures [15,16] or ferromagnetic Weyl semimetals discovered recently [11][12][13][17][18][19][20]. Following the general method introduced in Refs.…”

Section: Introduction-mentioning

confidence: 99%

Topological magnetotorsional effect in Weyl semimetals

Liang

Ojanen

2020

Phys. Rev. Research

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In this work we introduce a thermal magnetotorsional effect (TME) as a novel topological response in magnetic Weyl semimetals. We predict that magnetization gradients perpendicular to the Weyl node separation give rise to temperature gradients depending only on the local positions of the Weyl nodes. The TME is a consequence of magnetization-induced effective torsional spacetime geometry and the finite temperature Nieh-Yan anomaly. Similarly to anomalous Hall effect and chiral anomaly, the TME has a universal material-independent form. We predict that the TME can be observed in magnetic Weyl semimetal EuCd2As2.

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“…Here, we introduce 1D reactions with extreme transformation of the 2D‐Xene covalent framework and recruit them to illustrate the concept of reaction dimensionality and its use for synthesis control at the nanoscale. Starting with MX 2 , we produce films of layered MA 2 X 2 phases—a numerous class of materials best known for thermoelectric properties [ 26 ] but also boasting topological properties established by both theory [ 27–29 ] and recent experiments on magnetically induced Weyl [ 30–32 ] and Dirac [ 33 ] states. We prove that 1D reactions make a synthetic route to produce MA 2 X 2 for a selection of M and X, probe different templates, establish the reaction mechanism.…”

Section: Introductionmentioning

confidence: 99%

Dimensionality Concept in Solid‐State Reactions: A Way to Control Synthesis of Functional Materials at the Nanoscale

Tokmachev

Averyanov

Karateev

et al. 2020

Adv Funct Materials

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The concept of dimensionality is fundamental in physics, chemistry, materials science, etc. Low-dimensional and layered materials are distinguished by their unique physical properties and applications. Concurrently, low-dimensional reactants, products, and reaction spaces extend the toolbox of materials science considerably. Here, the concept of dimensionality is adapted to solid-state reactions by counting the basic axes along which the unit cell undergoes significant expansion/shrinking. For illustration, 1D synthesis of layered ternary compounds MA 2 X 2 via derivatives of 2D-Xenes, silicene, and germanene, is demonstrated, and the reaction mechanism and the role of templates are determined. The approach is then extended to 1D synthesis of non-layered compounds. The 1D nature of the reactions, established with structural studies, is explored by nanoscale confinement. The mutual orientation of the reaction and confinement-parallel (thus preventing the lattice expansion) or orthogonal-controls the reaction pathways and outcome. The work provides a proof-of-concept for anisotropic reactivity caused by directional confinement.

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Magnetic exchange induced Weyl state in a semimetal EuCd2Sb2

Abstract: Magnetic Weyl semimetals (WSMs) bearing long-time pursuing are still very rare. We herein identified magnetic exchange induced Weyl state in EuCd 2 Sb 2 , a semimetal in type IV magnetic space group, via performing high magnetic field

Cited by 52 publications

References 71 publications

Anomalous conductance scaling in strained Weyl semimetals

Anomalous conductance scaling in strained Weyl semimetals

Topological magnetotorsional effect in Weyl semimetals

Dimensionality Concept in Solid‐State Reactions: A Way to Control Synthesis of Functional Materials at the Nanoscale

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