{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:YC6ZG5DBGF2R3FLLOMM74UA3GZ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"834b9b291d14f42ad87b42c701d247db1f36435fae8302cd1a6151a1821c6439","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-02-09T23:27:49Z","title_canon_sha256":"260da4981d6daff1bb90c8f70ce1c74a29bd997130e5ef7e9922070dff3766da"},"schema_version":"1.0","source":{"id":"1502.02729","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.02729","created_at":"2026-05-18T02:09:54Z"},{"alias_kind":"arxiv_version","alias_value":"1502.02729v2","created_at":"2026-05-18T02:09:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.02729","created_at":"2026-05-18T02:09:54Z"},{"alias_kind":"pith_short_12","alias_value":"YC6ZG5DBGF2R","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"YC6ZG5DBGF2R3FLL","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"YC6ZG5DB","created_at":"2026-05-18T12:29:50Z"}],"graph_snapshots":[{"event_id":"sha256:17189983821eea47ab7eb3b516f648f603d6d6b6b26de2192918a40b86d7e80f","target":"graph","created_at":"2026-05-18T02:09:54Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"In this review we recapitulate the basic features of the flat-band spin systems and briefly summarize earlier studies in the field. Main emphasis is made on recent developments which include results for both spin and electron flat-band models. In particular, for flat-band spin systems we highlight field-driven phase transitions for frustrated quantum Heisenberg antiferromagnets at low temperatures, chiral flat-band states, as well as the effect of a slight dispersion of a previously strictly flat band due to nonideal lattice geometry. For electronic systems, we discuss the universal low-temper","authors_text":"Johannes Richter, Mykola Maksymenko, Oleg Derzhko","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-02-09T23:27:49Z","title":"Strongly correlated flat-band systems: The route from Heisenberg spins to Hubbard electrons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.02729","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:51fad39faa76c2cfb3c3e98093f60317ba0af6b0d9010ab182a88886f883c01b","target":"record","created_at":"2026-05-18T02:09:54Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"834b9b291d14f42ad87b42c701d247db1f36435fae8302cd1a6151a1821c6439","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-02-09T23:27:49Z","title_canon_sha256":"260da4981d6daff1bb90c8f70ce1c74a29bd997130e5ef7e9922070dff3766da"},"schema_version":"1.0","source":{"id":"1502.02729","kind":"arxiv","version":2}},"canonical_sha256":"c0bd93746131751d956b7319fe501b367ed43878b54fb8e5580f4071083a87c3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c0bd93746131751d956b7319fe501b367ed43878b54fb8e5580f4071083a87c3","first_computed_at":"2026-05-18T02:09:54.225475Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:09:54.225475Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lfnYizklyI4WWgrLmhSTYpB/9Uq4jSMl2y8uNYJS8UWKIyhWVjBuxMIWL86He+RRkLyQTklVjlEUKm8IZAYbAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:09:54.226114Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.02729","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:51fad39faa76c2cfb3c3e98093f60317ba0af6b0d9010ab182a88886f883c01b","sha256:17189983821eea47ab7eb3b516f648f603d6d6b6b26de2192918a40b86d7e80f"],"state_sha256":"aa958dec31931c663135436765c4a23e06df2da7e27760fba73bb785a17f60dc"}