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Observation of surface Fermi arcs in altermagnetic Weyl semimetal CrSb

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arxiv 2407.13497 v1 pith:7CFHRFJ7 submitted 2024-07-18 cond-mat.mtrl-sci cond-mat.other

Wenlong Lu , Shiyu Feng , Yuzhi Wang , Dong Chen , Zihan Lin , Xin Liang , Siyuan Liu , Wanxiang Feng
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Kohei Yamagami Junwei Liu Claudia Felser Quansheng Wu Junzhang Ma
This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.other
keywords bandweylcrsbfermispacesurfacealtermagnetaltermagnets
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As a special type of collinear antiferromagnetism (AFM), altermagnetism has garnered significant research interest recently. Altermagnets exhibit broken parity-time symmetry and zero net magnetization in real space, leading to substantial band splitting in momentum space even in the absence of spin-orbit coupling. Meanwhile, parity-time symmetry breaking always induce nontrivial band topology such as Weyl nodes. While Weyl semimetal states and nodal lines have been theoretically proposed in altermagnets, rare reports of experimental observation have been made up to this point. Using ARPES and first-principles calculations, we systematically studied the electronic structure of the room-temperature altermagnet candidate CrSb. At generic locations in momentum space, we clearly observed band spin splitting. Furthermore, we identified discrete surface Fermi arcs on the (100) cleaved side surface close to the Fermi level originating from bulk band topology. Our results imply that CrSb contains interesting nontrivial topological Weyl physics, in addition to being an excellent room temperature altermagnet.

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Cited by 5 Pith papers

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  1. Interaction-Induced Topological Phase Transition in Magnetic Weyl Semimetals

    cond-mat.mes-hall 2024-12 conditional novelty 7.0 of 10

    Spin-wave interactions can annihilate Weyl nodes of one handedness below the magnetic ordering temperature while leaving the opposite handedness intact, producing a temperature-driven topological transition in a model...

  2. Altermagnetism in modified Lieb lattice Hubbard model

    cond-mat.str-el 2024-12 conditional novelty 6.0 of 10

    Unbiased Hartree-Fock and exact diagonalization find altermagnetic Mott insulating and metallic phases in the Lieb lattice Hubbard model with interactions only on the transition-metal sublattices.

  3. N\'eel vector-dependent anomalous transport in altermagnetic metal CrSb

    cond-mat.mtrl-sci 2024-12 conditional novelty 6.0 of 10

    First-principles calculations predict that CrSb shows a Neel-vector-dependent anomalous Hall conductivity up to 72 S/cm and a room-temperature anomalous Nernst conductivity of -0.19 A/m/K, both maximal when the Neel v...

  4. Scaling Behavior of Magnetoresistance and Hall Resistivity in Altermagnet CrSb

    cond-mat.mtrl-sci 2024-12 conditional novelty 5.0 of 10

    In altermagnet CrSb, magnetoresistance and Hall resistivity obey extended Kohler scaling, and the nonlinear Hall effect arises from multi-band conduction, not an anomalous Hall effect.

  5. Symmetry, microscopy and spectroscopy signatures of altermagnetism

    cond-mat.mtrl-sci 2025-06 unverdicted

    A review of the symmetry, microscopic origin, and detection of altermagnetism, a collinear magnetic phase with alternating spin polarization in momentum space.

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