{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2f538830f09f0af4b265c9c5d7b30ff986e1e630be1039c51bfa33e52c04b5a0","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1352256337dd06ce47740c56b8010406d7cafe140f6948dde7da90988f00ab02","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.twisted-tmd.fractional-spin-hall","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"At three holes per moire cell, twisted MoTe2 near 2.1 degrees conducts along its edges with $3/2$ times the basic conductance quantum $e^{2}/h$ while keeping time-reversal symmetry (no preferred direction of time), and no accepted theory explains it.","posed_since":"2024","precise":"Kang et al. (Nature 628, 522, 2024) reported in 2.1 deg twisted bilayer MoTe2 at hole filling $\\nu = 3$ a state with vanishing Hall response and edge conductance near $\\left(3/2\\right)e^2/h$, interpreted as a fractional quantum spin Hall state, possibly a time-reversal pair of $3/2$ fractional Chern insulators. Identify its topological order (for example a time-reversal-symmetric non-Abelian state built from two Moore-Read halves, or an Abelian fractional topological insulator) and its edge theory, and determine whether the edge conductance is quantized. An answer is a topological order whose predicted edge conductance, quasiparticle charge and spin response match data.","problem_ref":null,"references":"","settled_by":"Reproduction in independent devices plus edge shot-noise and nonlocal transport fixing the quasiparticle charge and edge-mode count.","status_note":"2024-2026 theory proposes non-Abelian spin Hall states (e.g., arXiv:2406.14617) and a 2026 preprint (arXiv:2601.18508) reports a fractional topological insulator candidate; the state is not identified.","title":"Nature of the fractional quantum spin Hall state in twisted 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