{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"d77d16c53c6ef969d14332fd7cb7b3647238d34f5cdebbe8e6525e86dfbaa742","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","d2c0015a32005f194573e0365b5df5ce5384fd68d97702d4cdd2a2f57594eb35"],"salt":"812b8e3ffdfd3cac94cc7f2c93f5fe0182de25256f0ba38c79f83ca6d8f82c64","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.kitaev-materials.half-quantized-plateau","kind":"well-posed","literature_status":"contested","n":"1","parents":[{"note":"","parent_revision":"d2c0015a32005f194573e0365b5df5ce5384fd68d97702d4cdd2a2f57594eb35","relation":"special_case"}],"plain":"One group reported that the sideways heat flow stops changing with field at exactly half of a fundamental quantum value, the signature of a single Majorana edge channel. Other groups saw values near it without a flat plateau, or a strongly temperature-dependent signal, so it is unclear whether it is a real property of the material.","posed_since":"2018","precise":"Test whether $\\kappa_{xy}/T = (1/2)(\\pi^2 k_B^2/3h)$ holds within 10 percent over a finite field range in $\\alpha$-RuCl3 in the field-induced disordered regime (in-plane $H$ near 70 to 90 kOe, $T$ about 4 to 6 K), and whether it is independent of sample width and of $\\kappa_{xx}$ as an edge mode requires. An answer is yes with reproducible data from independent groups, or a demonstration that the apparent plateau is an accidental crossing of a nonquantized phonon or magnon signal.","problem_ref":null,"references":"","settled_by":"Independent measurements on multiple samples of different widths and $\\kappa_{xx}$ values, including constrictions, showing the plateau value and its size independence, or its absence.","status_note":"Reported by Kasahara et al. (Nature 2018) and Yokoi et al. (Science 2021); Bruin et al. (Nature Physics 2022) found $\\kappa_{xy}/T$ near the half-quantized value over an extended region but without a strict plateau; Czajka et al. (Nature Materials 2023) found a strongly $T$-dependent kappa_xy/T and attributed it to topological magnons.","title":"Is the half-quantized thermal Hall plateau in $\\alpha$-RuCl3 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