{"paper":{"title":"Microscopic Theory of Chiral-Phonon-Induced Orbital Selectivity in Helical Crystals","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Chiral phonons in helical crystals transfer angular momentum to electron orbitals via crystal angular momentum conservation.","cross_cats":[],"primary_cat":"cond-mat.other","authors_text":"Akihito Kato, Alexander S. Ovchinnikov, Jun-ichiro Kishine, Tomomi Tateishi","submitted_at":"2026-04-28T07:44:22Z","abstract_excerpt":"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 mo"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"phonon-induced local rotations generate a rotational electron-phonon interaction proportional to L̂±, which drives the orbital transfer m_ℓ→m_ℓ−m_s in accordance with crystal angular momentum (CAM) conservation, where m_s=±1 denotes the eigenvalue of the phonon rotational mode. Evaluating ⟨L̂^z⟩ 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.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The assumption that the rotational electron-phonon interaction is strictly proportional to L̂± and that leading-order perturbation theory suffices to capture the orbital response without higher-order corrections or strong-coupling effects, particularly given the reliance on line-group symmetry L3_1 for the threefold helical crystal.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Chiral phonons in L3_1 helical crystals generate rotational electron-phonon interactions that drive orbital angular momentum transfer m_ℓ to m_ℓ - m_s, with the response suppressed at Γ and zone boundary but enhanced at intermediate wavevectors due to phonon band degeneracies.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Chiral phonons in helical crystals transfer angular momentum to electron orbitals via crystal angular momentum conservation.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"8a1bc5616a696b41defef42b51209c7658744a8da7d38d29fb05c3898f2e2851"},"source":{"id":"2604.25328","kind":"arxiv","version":2},"verdict":{"id":"be03e1ea-75cf-4fc0-be41-5ed75e04fe77","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-07T14:00:36.787343Z","strongest_claim":"phonon-induced local rotations generate a rotational electron-phonon interaction proportional to L̂±, which drives the orbital transfer m_ℓ→m_ℓ−m_s in accordance with crystal angular momentum (CAM) conservation, where m_s=±1 denotes the eigenvalue of the phonon rotational mode. Evaluating ⟨L̂^z⟩ 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.","one_line_summary":"Chiral phonons in L3_1 helical crystals generate rotational electron-phonon interactions that drive orbital angular momentum transfer m_ℓ to m_ℓ - m_s, with the response suppressed at Γ and zone boundary but enhanced at intermediate wavevectors due to phonon band degeneracies.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The assumption that the rotational electron-phonon interaction is strictly proportional to L̂± and that leading-order perturbation theory suffices to capture the orbital response without higher-order corrections or strong-coupling effects, particularly given the reliance on line-group symmetry L3_1 for the threefold helical crystal.","pith_extraction_headline":"Chiral phonons in helical crystals transfer angular momentum to electron orbitals via crystal angular momentum conservation."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.25328/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-21T05:33:31.968232Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T21:13:29.453911Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"3ce295ff06770557cbfeb30ef8ae94386570223f7a793345c305564fbb9332c7"},"references":{"count":35,"sample":[{"doi":"","year":1962,"title":"V . S. V onsovskii and M. S. Svirskii, Sov. Phys. Solid State 3, 1568 (1962)","work_id":"","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2014,"title":"L. Zhang and Q. Niu, Phys. Rev. Lett. 112, 085503 (2014)","work_id":"","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2015,"title":"L. Zhang and Q. Niu, Phys. Rev. Lett. 115, 115502 (2015)","work_id":"","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2025,"title":"D. M. Juraschek, R. M. Geilhufe, H. Zhu, M. Basini, P . Baum, A. Bay- din, S. Chaudhary, M. Fechner, B. Flebus, G. Grissonnanche, A. I. Kirilyuk, M. Lemeshko, S. F. Maehrlein, M. Mignolet, S. Mura kam","work_id":"","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2018,"title":"M. Hamada, E. Minamitani, M. Hirayama, and S. Murakami, Ph ys. Rev. Lett. 121, 175301 (2018)","work_id":"","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":2,"snapshot_sha256":"7a1b9b5c81200e137b8170ab3a0838c845cf2de0b31e164125301277c70b3a5b","internal_anchors":1},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}