Microscopic Theory of Chiral-Phonon-Induced Orbital Selectivity in Helical Crystals
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arXiv
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| Format: | Preprint |
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2026
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| author | Tateishi, Tomomi Kato, Akihito Ovchinnikov, Alexander S. Kishine, Jun-ichiro |
| author_facet | Tateishi, Tomomi Kato, Akihito Ovchinnikov, Alexander S. Kishine, Jun-ichiro |
| contents | We present a microscopic theory of chirality-induced orbital selectivity (CIOS) in helical crystals, in which truly chiral phonons selectively transfer angular momentum to electronic orbital degrees of freedom. For a threefold helical crystal with line-group symmetry $L3_1$, we show that phonon-induced local rotations generate a rotational electron-phonon interaction proportional to $\hat{L}^{\pm}$, which drives the orbital transfer $m_{\ell}\to m_{\ell}-m_{s}$ in accordance with crystal angular momentum (CAM) conservation, where $m_{s}=\pm 1$ denotes the eigenvalue of the phonon rotational mode. Evaluating $\langle\hat{L}^{z}\rangle$ to leading order in perturbation theory, we find that the orbital response is suppressed near the $Γ$ point and the BZ boundary, and enhanced at intermediate wave vectors -- a feature intimately tied to the degeneracy structure of the phonon bands. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_25328 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Microscopic Theory of Chiral-Phonon-Induced Orbital Selectivity in Helical Crystals Tateishi, Tomomi Kato, Akihito Ovchinnikov, Alexander S. Kishine, Jun-ichiro Other Condensed Matter We present a microscopic theory of chirality-induced orbital selectivity (CIOS) in helical crystals, in which truly chiral phonons selectively transfer angular momentum to electronic orbital degrees of freedom. For a threefold helical crystal with line-group symmetry $L3_1$, we show that phonon-induced local rotations generate a rotational electron-phonon interaction proportional to $\hat{L}^{\pm}$, which drives the orbital transfer $m_{\ell}\to m_{\ell}-m_{s}$ in accordance with crystal angular momentum (CAM) conservation, where $m_{s}=\pm 1$ denotes the eigenvalue of the phonon rotational mode. Evaluating $\langle\hat{L}^{z}\rangle$ to leading order in perturbation theory, we find that the orbital response is suppressed near the $Γ$ point and the BZ boundary, and enhanced at intermediate wave vectors -- a feature intimately tied to the degeneracy structure of the phonon bands. |
| title | Microscopic Theory of Chiral-Phonon-Induced Orbital Selectivity in Helical Crystals |
| topic | Other Condensed Matter |
| url | https://arxiv.org/abs/2604.25328 |