{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"55c69470a48ccd8d6f53fd7eebea7ba12447dae9a302adb4087d1b291583fce3","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["2da52d2b726fec8da2368a4114caf0498faf393547d6f7f4b5c0e85ee40d03c4","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"f4b7661688ef160646e3a99f466207ca48c7ed19d790b7adb8e54e4801170c68","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.heavy-fermions.smb6-topological-surface","kind":"well-posed","literature_status":"partially-resolved","n":"2","parents":[],"plain":"$\\mathrm{SmB_6}$ conducts on its surface while its interior insulates at low temperature; theory predicts these surface states are topological, meaning protected by symmetry and band structure, but this is not settled.","posed_since":"2010","precise":"Determine whether the conducting surfaces of $\\mathrm{SmB_6}$ are protected by the time-reversal Z2 invariant from $f-d$ band inversion at the $X$ points, with an odd number of Dirac cones, or are trivial polar-surface states. An answer is spin-resolved ARPES and transport (weak antilocalization, thickness independence) on several crystal faces, consistent with a Z2 index computed from the bulk bands.","problem_ref":"2da52d2b726fec8da2368a4114caf0498faf393547d6f7f4b5c0e85ee40d03c4","references":"","settled_by":"Spin-resolved ARPES locating Dirac points on at least two surface orientations plus transport showing surface conduction independent of surface termination.","status_note":"Surface conduction below about 4 K is established by transport; ARPES evidence on spin texture and Dirac points remains disputed.","title":"Is $\\mathrm{SmB_6}$ a topological Kondo 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