{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a25203cf27ff45a4280fbb8d4796d1441e35d1c406797f60b7c180ec161566cb","created":"2026-10-03T07:17:58Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","f159fbfe9897b7637db89b78bc61c72cc6dc0581df4d9dfcbbb4ffc8cfb31fa8"],"salt":"342a8c3f703976ada8534c45cd97741d3424ac04eac00933e0a4d782e99e202a","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"chem.ciss.two-terminal-ingredient","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"f159fbfe9897b7637db89b78bc61c72cc6dc0581df4d9dfcbbb4ffc8cfb31fa8","relation":"special_case"}],"plain":"Symmetry theorems say that in the simplest setup, with one entrance, one exit, low voltage and no energy loss along the way, a molecule cannot produce the measured spin signal. Experiments still see a signal, so something must break the assumptions of these theorems.","posed_since":"","precise":"For a two-terminal junction of a chiral molecule, time-reversal symmetry forbids spin polarization of the current in single-channel coherent transport between nonmagnetic leads (Bardarson theorem, J. H. Bardarson, J. Phys. A 41, 405203, 2008, https://doi.org/10.1088/1751-8113/41/40/405203), and Onsager reciprocity forbids any magnetoconductance asymmetry $G(M) - G(-M)$ in linear response when one electrode is a ferromagnet of magnetization $M$, for any number of channels. Identify which ingredient (dephasing or leakage channels, electron-electron interaction, electron-vibration coupling, nonlinear bias, interface spinterface effects) produces magnetoconductance asymmetry of the measured size, and prove which are necessary. An answer is a model calculation giving the measured asymmetry and its bias dependence.","problem_ref":null,"references":"","settled_by":"Model and first-principles calculations of nonlinear magnetotransport compared with bias- and temperature-dependent measurements on the same molecule.","status_note":"","title":"Minimal ingredient for CISS magnetoresistance in two-terminal 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