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Topological Weyl altermagnetism in CrSb

Li, Cong ; Hu, Mengli ; Li, Zhilin ; Wang, Yang ; Chen, Wanyu ; Thiagarajan, Balasubramanian LU ; Leandersson, Mats LU ; Polley, Craig LU ; Kim, Timur and Liu, Hui , et al. (2025) In Communications Physics 8(1).
Abstract

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. Using high-resolution angle-resolved photoemission... (More)

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. Using high-resolution angle-resolved photoemission spectroscopy, we observe the large momentum-dependent spin-splitting in CrSb that induces altermagnetic Weyl nodes. We observe the related topological Fermi-arcs, which in electronic structure calculations are spin polarized. This indicates that in altermagnets the large energy scale intrinsic to their spin-splitting creates its own realm of robust electronic topology.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Communications Physics
volume
8
issue
1
article number
311
publisher
Nature Publishing Group
external identifiers
  • scopus:105012228584
ISSN
2399-3650
DOI
10.1038/s42005-025-02232-9
language
English
LU publication?
yes
id
f3864c79-883f-4214-acbf-290d30ec6487
date added to LUP
2025-10-27 14:29:35
date last changed
2025-10-27 14:30:46
@article{f3864c79-883f-4214-acbf-290d30ec6487,
  abstract     = {{<p>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. Using high-resolution angle-resolved photoemission spectroscopy, we observe the large momentum-dependent spin-splitting in CrSb that induces altermagnetic Weyl nodes. We observe the related topological Fermi-arcs, which in electronic structure calculations are spin polarized. This indicates that in altermagnets the large energy scale intrinsic to their spin-splitting creates its own realm of robust electronic topology.</p>}},
  author       = {{Li, Cong and Hu, Mengli and Li, Zhilin and Wang, Yang and Chen, Wanyu and Thiagarajan, Balasubramanian and Leandersson, Mats and Polley, Craig and Kim, Timur and Liu, Hui and Fulga, Cosma and Vergniory, Maia G. and Janson, Oleg and Tjernberg, Oscar and van den Brink, Jeroen}},
  issn         = {{2399-3650}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Communications Physics}},
  title        = {{Topological Weyl altermagnetism in CrSb}},
  url          = {{http://dx.doi.org/10.1038/s42005-025-02232-9}},
  doi          = {{10.1038/s42005-025-02232-9}},
  volume       = {{8}},
  year         = {{2025}},
}