Electric-field-induced X-ray Nonreciprocal Dichroism in Hematite
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915880376467456 |
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| author | Hayashida, Takeshi Matsumoto, Koei Arakawa, Keito Joly, Yves Di Matteo, Sergio Tamasaku, Kenji Tanaka, Yoshikazu Kimura, Tsuyoshi |
| author_facet | Hayashida, Takeshi Matsumoto, Koei Arakawa, Keito Joly, Yves Di Matteo, Sergio Tamasaku, Kenji Tanaka, Yoshikazu Kimura, Tsuyoshi |
| contents | Hematite (alpha-Fe2O3) is a prototypical room temperature antiferromagnet whose time-reversal-odd magnetic structure has recently attracted renewed attention. While such magnetic symmetry can be characterized in terms of higher-order multipoles beyond the magnetic dipole, their manifestation in measurable physical phenomena has remained largely elusive. In this work, we investigate x-ray absorption near the Fe K-edge of hematite under an applied electric field, which explicitly breaks space-inversion symmetry. We observe an electric-field-induced x-ray nonreciprocal linear dichroism (E-induced XNLD) that reflects the time-reversal-odd nature of the magnetic order. Numerical simulations based on ab-initio density functional theory reproduce the observed spectra, including their dependence on the antiferromagnetic domain and x-ray polarization. Furthermore, a symmetry-resolved multipole analysis reveals that this response originates from the magnetic quadrupole and the magnetic toroidal octupole induced by the applied electric field. These results demonstrate that electric-field-modulated x-ray absorption provides direct access to the antiferroic order of higher-order multipoles in time-reversal-odd antiferromagnets, thereby establishing a general framework to uncover hidden symmetry properties in magnetic materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_20737 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electric-field-induced X-ray Nonreciprocal Dichroism in Hematite Hayashida, Takeshi Matsumoto, Koei Arakawa, Keito Joly, Yves Di Matteo, Sergio Tamasaku, Kenji Tanaka, Yoshikazu Kimura, Tsuyoshi Materials Science Hematite (alpha-Fe2O3) is a prototypical room temperature antiferromagnet whose time-reversal-odd magnetic structure has recently attracted renewed attention. While such magnetic symmetry can be characterized in terms of higher-order multipoles beyond the magnetic dipole, their manifestation in measurable physical phenomena has remained largely elusive. In this work, we investigate x-ray absorption near the Fe K-edge of hematite under an applied electric field, which explicitly breaks space-inversion symmetry. We observe an electric-field-induced x-ray nonreciprocal linear dichroism (E-induced XNLD) that reflects the time-reversal-odd nature of the magnetic order. Numerical simulations based on ab-initio density functional theory reproduce the observed spectra, including their dependence on the antiferromagnetic domain and x-ray polarization. Furthermore, a symmetry-resolved multipole analysis reveals that this response originates from the magnetic quadrupole and the magnetic toroidal octupole induced by the applied electric field. These results demonstrate that electric-field-modulated x-ray absorption provides direct access to the antiferroic order of higher-order multipoles in time-reversal-odd antiferromagnets, thereby establishing a general framework to uncover hidden symmetry properties in magnetic materials. |
| title | Electric-field-induced X-ray Nonreciprocal Dichroism in Hematite |
| topic | Materials Science |
| url | https://arxiv.org/abs/2603.20737 |