{"paper":{"title":"Weak Electron-Phonon Coupling Is Insufficient to Generate Significant CISS in Two-Terminal Transport","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Fully self-consistent calculations find that weak electron-phonon coupling produces negligible spin polarization in two-terminal helical junctions.","cross_cats":["cond-mat.other"],"primary_cat":"cond-mat.mes-hall","authors_text":"Amikam Levy, Vipul Upadhyay","submitted_at":"2026-01-21T15:08:10Z","abstract_excerpt":"A central open question in chiral-induced spin selectivity (CISS) is whether weak electron-phonon coupling in a helical molecular junction can generate a sizable spin polarization in two-terminal transport without invoking additional strong symmetry-breaking ingredients. We address this question by implementing a self-consistent nonequilibrium Green's function (NEGF) calculation for a helical tight-binding model with spin-orbit coupling and electron-phonon interactions. The electron-phonon self-energies are evaluated self-consistently, and the transport signal is extracted using the standard m"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"In contrast to large polarizations and anomalous size trends reported under approximate treatments, the fully self-consistent calculation yields negligible spin polarization, additionally the electron-phonon coupling mainly renormalizes the spectrum, and transport remains quasi-ballistic across the explored parameter range.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The helical tight-binding model with spin-orbit coupling plus the self-consistent Born approximation for electron-phonon self-energies fully captures the relevant physics without needing additional strong symmetry-breaking terms.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Fully self-consistent treatment of electron-phonon interactions in helical junctions yields negligible spin polarization, in contrast to results from approximate self-energy schemes.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Fully self-consistent calculations find that weak electron-phonon coupling produces negligible spin polarization in two-terminal helical junctions.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"b2e533c77554772a44a91ca9c1feaf5cf252510fd580d26a9967eb1e73c90b0e"},"source":{"id":"2601.15063","kind":"arxiv","version":3},"verdict":{"id":"39940cc1-3a84-489f-a3ba-731f564dbe20","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T12:24:07.301080Z","strongest_claim":"In contrast to large polarizations and anomalous size trends reported under approximate treatments, the fully self-consistent calculation yields negligible spin polarization, additionally the electron-phonon coupling mainly renormalizes the spectrum, and transport remains quasi-ballistic across the explored parameter range.","one_line_summary":"Fully self-consistent treatment of electron-phonon interactions in helical junctions yields negligible spin polarization, in contrast to results from approximate self-energy schemes.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The helical tight-binding model with spin-orbit coupling plus the self-consistent Born approximation for electron-phonon self-energies fully captures the relevant physics without needing additional strong symmetry-breaking terms.","pith_extraction_headline":"Fully self-consistent calculations find that weak electron-phonon coupling produces negligible spin polarization in two-terminal helical junctions."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2601.15063/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"e51b06de17759c6924b3c28b750d0e6992b5fefa94eb209a21b72427045457b6"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}