Electric toroidal octupolar symmetry in pyrite FeS$_2$ probed by Raman optical activity
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914414353973248 |
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| author | Suganuma, Yuki Kusuno, Gakuto Watanabe, Hikaru Oiwa, Rikuto Mori, Hitoshi Arita, Ryotaro Satoh, Takuya |
| author_facet | Suganuma, Yuki Kusuno, Gakuto Watanabe, Hikaru Oiwa, Rikuto Mori, Hitoshi Arita, Ryotaro Satoh, Takuya |
| contents | We report Raman optical activity in pyrite FeS$_2$, which hosts an electric toroidal octupolar symmetry. A clear and reproducible sign reversal of the circular intensity difference is observed between neighboring $\{111\}$ faces under cross-circular polarization. The signal appears only for the doubly degenerate $E_g$ phonon mode and is absent for other modes, consistent with symmetry analysis. First-principles calculations reproduce these features, establishing Raman optical activity as a probe of higher-rank axial multipolar symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_21756 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electric toroidal octupolar symmetry in pyrite FeS$_2$ probed by Raman optical activity Suganuma, Yuki Kusuno, Gakuto Watanabe, Hikaru Oiwa, Rikuto Mori, Hitoshi Arita, Ryotaro Satoh, Takuya Materials Science We report Raman optical activity in pyrite FeS$_2$, which hosts an electric toroidal octupolar symmetry. A clear and reproducible sign reversal of the circular intensity difference is observed between neighboring $\{111\}$ faces under cross-circular polarization. The signal appears only for the doubly degenerate $E_g$ phonon mode and is absent for other modes, consistent with symmetry analysis. First-principles calculations reproduce these features, establishing Raman optical activity as a probe of higher-rank axial multipolar symmetry. |
| title | Electric toroidal octupolar symmetry in pyrite FeS$_2$ probed by Raman optical activity |
| topic | Materials Science |
| url | https://arxiv.org/abs/2603.21756 |