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Topological Weyl Altermagnetism in CrSb
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Altermagnets constitute a novel, third fundamental class of collinear magnetic ordered materials, alongside with ferro- and antiferromagnets. They share with conventional antiferromagnets the feature of a vanishing net magnetization. At the same time they show a spin-splitting of electronic bands, just as in ferromagnets, caused by the atomic exchange interaction. On the other hand, topology has recently revolutionized our understanding of condensed matter physics, introducing new phases of matter classified by intrinsic topological order. Here we connect the worlds of altermagnetism and topology, showing that the electronic structure of the altermagnet CrSb is topological and hosts a novel Weyl semimetallic state. Using high-resolution and spin angleresolved photoemission spectroscopy, we observe a large momentum-dependent spin-splitting in CrSb, reaching up to 1 eV, that induces altermagnetic Weyl nodes with an associated magnetic quantum number. At the surface we observe their spin-polarized topological Fermi-arcs. This establishes that in altermagnets the large energy scale intrinsic to the spin-splitting - orders of magnitude larger than the relativistic spin-orbit coupling - creates its own realm of robust electronic topology.
Forward citations
Cited by 5 Pith papers
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Emergent altermagnetism at surfaces of antiferromagnets: full symmetry classification and material identification
Surface termination of collinear antiferromagnets can induce altermagnetic surface states, systematically classified here and identified in 140+ MAGNDATA materials.
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Anomalous Hall viscosity of altermagnets
Phonon Hall viscosity distinguishes altermagnets through strain-space Berry curvature monopoles and shows sensitivity to electronic features like gapped Dirac points.
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Orbital altermagnetism on the kagome lattice and possible application to $A$V$_3$Sb$_5$
On an odd-sublattice kagome lattice, non-uniform collinear orbital moments from CDW/loop-current order can form a d-wave altermagnet with spin-split bands, as possibly realized in AV3Sb5.
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Theory of Angle Resolved Photoemission Spectroscopy of Altermagnetic Mott Insulators
Spinon-holon parton theory for ARPES response of altermagnetic Mott insulators predicts renormalized bandwidth and spin-split spectra with spin-dependent weights, confirmed via tensor network simulations.
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Topological nontrivial berry phase in altermagnet CrSb
CrSb shows a nontrivial Berry phase approaching π from SdH oscillations and DFT band calculations, supporting topological semimetal states in this altermagnet.
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