{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"d0718f6de4ea81d9b5dd7dbf0ec75990befa7413da357d8caf52c0bf6e621f74","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["3d2c7b020f52c604c4edc5dfc9913a4bc6449c8321932ab6d073d8fff744fa4c","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"8a9942e95a6ea0b0b48ba88f37694936dccc71396295ab8ad0a7725facdf1dc6","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":"2","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 $\\mathrm{SrTiO_3}$, (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":"3d2c7b020f52c604c4edc5dfc9913a4bc6449c8321932ab6d073d8fff744fa4c","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"ab388dc2fc4e5bbb80cb40fb3b782092708187ce0f774f4c3ae8f45fd61b2d89","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"c7cfb70c903f82810a72d7bc40d4bd412b8dbb4bd51578a6f3c3ec282dccbc43","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"jgk2cv6OjFLFhJCrBC8QTeqEaFvYEsZBbGriKUK_i9avrGDqcy0OYnS28pcpZx-S70ibeba8pB694PexybWlCA"},"schema":"pubphys.envelope/1"},"record_hash":"ab388dc2fc4e5bbb80cb40fb3b782092708187ce0f774f4c3ae8f45fd61b2d89","leaf_index":2878}