An ideal Weyl semimetal induced by magnetic exchange

Abstract

Weyl semimetals exhibit exceptional quantum electronic transport due to the presence of topologically-protected band crossings called Weyl nodes. The nodes come in pairs with opposite chirality, but their number and location in momentum space is otherwise material specific. Following the initial discoveries there is now a need for better material realizations, ideally comprising a single pair of Weyl nodes located at or very close to the Fermi level and in an energy window free from other overlapping bands. Here we propose the layered intermetallic EuCd${}_2$As${}_2$ to be such a system. We show that Weyl nodes in EuCd${}_2$As${}_2$ are magnetically-induced via exchange coupling, emerging when the Eu spins are aligned by a small external magnetic field. The identification of EuCd${}_2$As${}_2$ as a model magnetic Weyl semimetal, evidenced here by ab initio calculations, photoemission spectroscopy, quantum oscillations and anomalous Hall transport measurements, opens the door to fundamental tests of Weyl physics.

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• Consecutive topological phase transitions and colossal magnetoresistance in a magnetic topological semimetal
• Topological magnetotorsional effect in Weyl semimetals
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• Resonant X-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd${}_2$As${}_2$ and EuCd${}_2$Sb${}_2$
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• Topological Hall Effect Driven by Short-Range Magnetic Orders in EuZn${}_2$As${}_2$
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• Large unconventional anomalous Hall effect arising from spin chirality within domain walls of an antiferromagnet EuZn${}_2$Sb${}_2$
• Surface plasmon polaritons in strained Weyl semimetals
• Maximizing intrinsic anomalous Hall effect by controlling the Fermi level in simple Weyl semimetal films
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• Giant and Reversible Electronic Structure Evolution in a Magnetic Topological Material EuCd2As2
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• Carrier-induced transition from antiferromagnetic insulator to ferromagnetic metal in the layered phosphide EuZn${}_2$P${}_2$
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• Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet
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• Anomalous conductance scaling in strained Weyl semimetals
• Origin of the repulsive Casimir force in giant polarization-interconversion materials
• Weyl superconductor phases in a Weyl-semimetal/superconductor multilayer
• Anomalous sound attenuation in Weyl semimetals in magnetic and pseudomagnetic fields
• Absence of Weyl nodes in EuCd${}_2$As${}_2$ revealed by the carrier density dependence of the anomalous Hall effect
• Axions and Superfluidity in Weyl Semimetals
• Detection of Fermi Arcs in Weyl Semimetals through Surface Negative Refraction
• Anomaly-induced sound absorption in Weyl semimetals
• Intrinsic ferromagnetic axion states and a single pair of Weyl fermions in the stable-state Mn\emph{X}${}_2$\emph{B}${}_2$\emph{T}${}_6$-family materials
• Field-tunable Weyl points and large anomalous Hall effects in degenerate magnetic semiconductor EuMg${}_2$Bi${}_2$
• Anomalous Electromagnetic Field Penetration in a Weyl or Dirac Semimetal
• Long-Time Magnetic Relaxation in Antiferromagnetic Topological Material EuCd${}_2$As${}_2$
• Intrinsic insulating transport characteristics in low-carrier density EuCd2As2 films
• Topological van Hove singularities at phase transitions in Weyl metals
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• Strong suppression of electron convection in Dirac and Weyl semimetals
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• Near-field radiative heat transfer between graphene-covered Weyl semimetals
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• Ground state and polarization of an hydrogen-like atom near a Weyl semimetal
• Interplay of short-range bond order and A-type antiferromagnetic order in metallic triangular lattice GdZn${}_3$P${}_3$
• Electric and chiral response to a pseudoelectric field in Weyl materials
• Effective Tight-Binding Model of Compensated Ferrimagnetic Weyl Semimetal with Spontaneous Orbital Magnetization
• Origin of the large topological Hall effect in the EuCd${}_2$Sb${}_2$ antiferromagnet
• Thermodynamic and electrical transport properties of the half-Heusler plumbide TbAuPb
• Two body interactions induces the axion-phason field in Weyl semimetals
• Design, synthesis, and physical properties of the intergrowth compound Eu${}_2$CuZn${}_2$As${}_3$
• Giant-exchange-driven Vectorial Control of a Minimal Topological Magnet in Eu3In2As4