Generating ferro-spinetic polarizations in altermagnetic insulators
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914353403396096 |
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| author | Sato, Toshihiro Hu, Mengli Fulga, Ion Cosma Janson, Oleg Facio, Jorge I. Stroppa, Alessandro Assaad, Fakher F. Brink, Jeroen van den |
| author_facet | Sato, Toshihiro Hu, Mengli Fulga, Ion Cosma Janson, Oleg Facio, Jorge I. Stroppa, Alessandro Assaad, Fakher F. Brink, Jeroen van den |
| contents | Altermagnets are a novel class of fully spin-compensated magnetic materials that nevertheless have spin-split electronic bands, offering novel perspectives for spintronics applications. Based on a rigorous analysis of altermagnetic many-body models and their symmetry we establish the important role of two fundamental types of polarizations in altermagnetic insulators: the charge and the spinetic one, where the latter corresponds to a macroscopic spin-displacement field. First principles calculations confirm and quantify their presence in real materials. The two polarizations are directly coupled and emerge in orthogonal directions when inversion symmetry is broken, either by the system developing a spontaneously ferroelectric polarization (in ferroelectric altermagnets), or by a charge displacement induced by an external electric field (for inversion invariant altermagnetic insulators). This presence of large and switchable spin accumulations constitute an attractive fundamental feature of altermagnetic insulators. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_18973 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Generating ferro-spinetic polarizations in altermagnetic insulators Sato, Toshihiro Hu, Mengli Fulga, Ion Cosma Janson, Oleg Facio, Jorge I. Stroppa, Alessandro Assaad, Fakher F. Brink, Jeroen van den Strongly Correlated Electrons Materials Science Altermagnets are a novel class of fully spin-compensated magnetic materials that nevertheless have spin-split electronic bands, offering novel perspectives for spintronics applications. Based on a rigorous analysis of altermagnetic many-body models and their symmetry we establish the important role of two fundamental types of polarizations in altermagnetic insulators: the charge and the spinetic one, where the latter corresponds to a macroscopic spin-displacement field. First principles calculations confirm and quantify their presence in real materials. The two polarizations are directly coupled and emerge in orthogonal directions when inversion symmetry is broken, either by the system developing a spontaneously ferroelectric polarization (in ferroelectric altermagnets), or by a charge displacement induced by an external electric field (for inversion invariant altermagnetic insulators). This presence of large and switchable spin accumulations constitute an attractive fundamental feature of altermagnetic insulators. |
| title | Generating ferro-spinetic polarizations in altermagnetic insulators |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2510.18973 |