{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"1588b887485bb667718c28a1a1bdc8ec45af32490fa3e03465fc718adc759ecb","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"2bd2aa5b871cf0248404d338fdce122653e5a1c7d718a74bf3a93716d18872e2","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.majorana-zero-modes.chiral-majorana-edge","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"A quantum anomalous Hall film (a magnetic film with a quantized Hall current at zero field) covered by a superconductor was predicted to carry one-directional Majorana edge channels; a 2017 report of their signature was retracted, and they remain unobserved.","posed_since":"2010","precise":"A magnetic topological insulator film in its quantum anomalous Hall state (Chern number $C = 1$) proximitized by an s-wave superconductor is predicted to enter a topological superconducting phase with Bogoliubov Chern number $N = 1$ and one chiral Majorana edge mode. The 2017 report of the predicted half-quantized two-terminal conductance $0.5 e^{2}/h$ was retracted, and Kayyalha et al. (Science 367, 2020, doi:10.1126/science.aax6361) showed such plateaus arise when the superconductor shorts the device. Determine whether the $N = 1$ phase exists in any such hybrid. An answer is a direct signature, such as thermal Hall conductance $\\kappa_{xy} = \\kappa_{0}/2$ with $\\kappa_{0} = \\pi^{2} k_{B}^{2} T/(3h)$, or an interferometric signal of a single chiral Majorana mode.","problem_ref":null,"references":"","settled_by":"Thermal conductance or Majorana interferometry on a proximitized quantum anomalous Hall edge, with geometries that exclude superconducting shorts.","status_note":"No chiral Majorana edge mode is established as of 2026, to this survey's knowledge.","title":"Chiral Majorana edge modes in anomalous Hall superconductor 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