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Topological responses from gapped Weyl points in 2D altermagnets

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arxiv 2403.09520 v2 pith:ED7MMTHI submitted 2024-03-14 cond-mat.mes-hall cond-mat.mtrl-sci

Kirill Parshukov , Raymond Wiedmann , Andreas P. Schnyder This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords gappedaltermagnetschernelectronicmagnonicphasespointsprotected
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abstract

We study the symmetry requirements for topologically protected spin-polarized Weyl points in 2D altermagnets. The topology is characterized by a quantized $\pi$-Berry phase and the degeneracy is protected by spin-space group symmetries. Gapped phases with finite Chern and/or spin/chirality Chern numbers emerge under different symmetry-breaking mass terms. We investigate the surface and transport properties of these gapped phases using representative electronic tight-binding and magnonic linear spin-wave models. In particular, we calculate the electronic and magnonic Hall currents and discuss implications for experiments.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Catalog of Altermagnetism in Magnetic Wallpaper/Space Groups and Nonsymmorphic Altermagnets

    cond-mat.mtrl-sci 2026-07 accept novelty 7.0 of 10

    Complete catalog finds 17 altermagnetic wallpaper groups and 422 space groups (including 262 non-centrosymmetric) and identifies nonsymmorphic hourglass spin-splitting patterns beyond the six established wave types.

  2. Elasto-Hall conductivity and the anomalous Hall effect in altermagnets

    cond-mat.mtrl-sci 2025-02 accept novelty 7.0 of 10

    Strain distorts the Berry curvature quadrupole of an altermagnet into a net monopole, producing an anomalous Hall effect linear in the electric field.

  3. Altermagnetism and Strain Induced Altermagnetic Transition in Cairo Pentagonal Monolayer

    cond-mat.str-el 2024-12 conditional novelty 7.0 of 10

    In a Cairo pentagonal monolayer, diagonal strain converts g-wave altermagnetic spin splitting into d-wave splitting, a transition reproduced in DFT for FeS2 and Nb2FeB2.

  4. Altermagnetism Induced Topological Phase Transitions in Kane-Mele Model

    cond-mat.mes-hall 2024-12 conditional novelty 6.0 of 10

    d-wave altermagnetism in the Kane-Mele model drives a Z2 topological insulator through second-order topological insulator and quantum anomalous Hall phases with Chern numbers ±1 and ±3.

  5. Strain-engineering spin-valley locking effect in altermagnetic monolayer with multipiezo properties

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

    Strain on the predicted altermagnetic monolayer Nb2SeTeO can switch it among anomalous valley Hall, quantum anomalous Hall, and quantum spin Hall phases.

  6. 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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