{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"c4d28890ff188c181451544a08bc8b44cd1259b25fc725bcacc2559233dea9de","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1b8c735072cc579f2a587941c8448bb766fdfd368a5ca01745921f5983286a3c","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":"1","parents":[],"plain":"SmB6 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 SmB6 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":null,"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 SmB6 a topological Kondo insulator","topic_ref":"348f0bf7a34a765b71c6ebd8ae84e9439d4dfb5f6e2b08600fcf48a04710cc34"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"2da52d2b726fec8da2368a4114caf0498faf393547d6f7f4b5c0e85ee40d03c4","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"aeebce7c9a2b4d62695ae2323d46a0b4016dd00f5e07f7c8fd9f9aa22e032094","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"kd_2GEBA-_EwbIICcWHWEFRrwciXgh4sKZ11-yvlNtz6baapy13WtcBCqcR0c_G8IoX4bpCSjPRw0b9omulOCA"},"schema":"pubphys.envelope/1"},"record_hash":"2da52d2b726fec8da2368a4114caf0498faf393547d6f7f4b5c0e85ee40d03c4","leaf_index":1015}