{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"14e23c17f1a28baf00dd6cfc846c5fb303f04f9727d854a4620c8d34ca85f94a","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"b9078d56f4953bd46d89b57491a2ae12b521a4814307706225fcb769aef6dd0a","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.iron-based.gap-sign-electron-pockets","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"In some FeSe compounds only electron pockets remain at the Fermi level, so the standard sign-changing scenario between hole and electron pockets cannot apply.","posed_since":"","precise":"For monolayer FeSe on SrTiO3, (Li,Fe)OHFeSe and KxFe2-ySe2, which lack hole pockets at $\\Gamma$, determine whether the gap changes sign between the electron pockets at $M$ (d-wave or bonding-antibonding $s\\pm$) or is sign-preserving ($s++$). An answer is a phase-sensitive test, such as quasiparticle interference with magnetic and nonmagnetic defects or defect-bound in-gap states, with unambiguous sign assignment.","problem_ref":null,"references":"","settled_by":"Phase-referenced quasiparticle interference or impurity-state spectroscopy on two such compounds yielding the same sign structure.","status_note":"","title":"Pairing symmetry of heavily electron-doped FeSe without hole pockets","topic_ref":"71fc7a5f7f45e0e897c1da37458bfa12479b8a0797fe32805a586a3c8fc44007"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"3d2c7b020f52c604c4edc5dfc9913a4bc6449c8321932ab6d073d8fff744fa4c","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"b8932953e1caa07faf6a950111a8938aca726a141d1c550746ec4a5dae14f2d2","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"XI7ksC_Vz6pB3TgSGlFRR0AA6uEPic7scPlKti7yDeK9S6cU-ZlRXtL3afEjUIJkmOw4A1n4MensARqiBncsBA"},"schema":"pubphys.envelope/1"},"record_hash":"3d2c7b020f52c604c4edc5dfc9913a4bc6449c8321932ab6d073d8fff744fa4c","leaf_index":1044}