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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
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2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2510.17522 |
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| _version_ | 1866908702899961856 |
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| author | Chen, Xin Zou, Jin Song, Lipeng Sun, Wei Wu, Yiwen Zhu, Luyao Cheng, Xu Wang, Duo Sanyal, Biplab |
| author_facet | Chen, Xin Zou, Jin Song, Lipeng Sun, Wei Wu, Yiwen Zhu, Luyao Cheng, Xu Wang, Duo Sanyal, Biplab |
| contents | Whether a zero-moment antiferromagnet can host an intrinsic half-metallic ground state with a single-spin Fermi surface remains an open question in antiferromagnetic spintronics. Existing proposals in compensated magnets reach only transport analogues of this limit and do not realize a genuine AFM half-metallic ground state with a single-spin Fermi surface. Here we show that in two-dimensional altermagnets the Néel-vector orientation acts as an intrinsic knob for magnetic-space-group reduction that lifts the degeneracy between spin sectors. Using Janus monolayer Ta$_2$TeSeO as a realistic and clean platform and combining symmetry analysis with first-principles calculations, we demonstrate that rotating the Néel vector first breaks the relevant mirror symmetry, opening a gap in one spin sector of symmetry-related Weyl pairs, and then breaks the residual $C_{2z}$ symmetry, shifting the remaining Weyl cones in opposite energy directions so that a single spin sector retains a Fermi surface at the Fermi level. These two symmetry-lowering steps convert a compensated altermagnetic Weyl semimetal into an intrinsic AFM half-metal. The nearly degenerate in-plane magnetic anisotropy then enables reversible switching between the two spin channels using minute strain or weak anisotropic fields. Because this mechanism relies solely on Néel-vector-induced symmetry reduction, it provides a general low-power route to intrinsic half-metallicity in compensated altermagnetic Weyl semimetals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_17522 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Néel-Vector-Orientation Induced Intrinsic Half-Metallicity in Two-Dimensional Altermagnets Chen, Xin Zou, Jin Song, Lipeng Sun, Wei Wu, Yiwen Zhu, Luyao Cheng, Xu Wang, Duo Sanyal, Biplab Mesoscale and Nanoscale Physics Materials Science Computational Physics Whether a zero-moment antiferromagnet can host an intrinsic half-metallic ground state with a single-spin Fermi surface remains an open question in antiferromagnetic spintronics. Existing proposals in compensated magnets reach only transport analogues of this limit and do not realize a genuine AFM half-metallic ground state with a single-spin Fermi surface. Here we show that in two-dimensional altermagnets the Néel-vector orientation acts as an intrinsic knob for magnetic-space-group reduction that lifts the degeneracy between spin sectors. Using Janus monolayer Ta$_2$TeSeO as a realistic and clean platform and combining symmetry analysis with first-principles calculations, we demonstrate that rotating the Néel vector first breaks the relevant mirror symmetry, opening a gap in one spin sector of symmetry-related Weyl pairs, and then breaks the residual $C_{2z}$ symmetry, shifting the remaining Weyl cones in opposite energy directions so that a single spin sector retains a Fermi surface at the Fermi level. These two symmetry-lowering steps convert a compensated altermagnetic Weyl semimetal into an intrinsic AFM half-metal. The nearly degenerate in-plane magnetic anisotropy then enables reversible switching between the two spin channels using minute strain or weak anisotropic fields. Because this mechanism relies solely on Néel-vector-induced symmetry reduction, it provides a general low-power route to intrinsic half-metallicity in compensated altermagnetic Weyl semimetals. |
| title | Néel-Vector-Orientation Induced Intrinsic Half-Metallicity in Two-Dimensional Altermagnets |
| topic | Mesoscale and Nanoscale Physics Materials Science Computational Physics |
| url | https://arxiv.org/abs/2510.17522 |