{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:OOIZKWRMTA75YTHTOMHRUU7WTI","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":"e1dd87a9d032ee93c7d05112ef84ce4c1ba31fc4482809ec5bd6e8d67f6bf348","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-08-18T15:39:13Z","title_canon_sha256":"1cb657849a98b0e22b7384d834902b6490b24d4261dd956b4afbb9e8a4cc449b"},"schema_version":"1.0","source":{"id":"1508.04357","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.04357","created_at":"2026-05-18T01:20:34Z"},{"alias_kind":"arxiv_version","alias_value":"1508.04357v2","created_at":"2026-05-18T01:20:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.04357","created_at":"2026-05-18T01:20:34Z"},{"alias_kind":"pith_short_12","alias_value":"OOIZKWRMTA75","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"OOIZKWRMTA75YTHT","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"OOIZKWRM","created_at":"2026-05-18T12:29:34Z"}],"graph_snapshots":[{"event_id":"sha256:e4505ab06f887753b00d6e1c6b8cc8e582bab4e304dc9b7a8050c150f2f5976c","target":"graph","created_at":"2026-05-18T01:20:34Z","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":"The Hubbard model, which augments independent-electron band theory with a single parameter to describe electron-electron correlations, is widely regarded to be the `standard model' of condensed matter physics. The model has been remarkably successful at addressing a range of correlation effects in solids, but beyond one dimension its solution is intractable. Much current research aims, therefore, at finding appropriate approximations to the Hubbard model phase diagram. Here we take the new approach of using ab initio electronic structure methods to design a material whose Hamiltonian is that o","authors_text":"M. Troyer, N. A. Spaldin, P. Staar, S. M. Griffin, T. C. Schulthess","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-08-18T15:39:13Z","title":"A Bespoke Single-Band Hubbard Model Material"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.04357","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:e9148c33604443df4a8451b52e79a204b7a7f1a7e8a12ed78175222460530b0c","target":"record","created_at":"2026-05-18T01:20:34Z","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":"e1dd87a9d032ee93c7d05112ef84ce4c1ba31fc4482809ec5bd6e8d67f6bf348","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-08-18T15:39:13Z","title_canon_sha256":"1cb657849a98b0e22b7384d834902b6490b24d4261dd956b4afbb9e8a4cc449b"},"schema_version":"1.0","source":{"id":"1508.04357","kind":"arxiv","version":2}},"canonical_sha256":"7391955a2c983fdc4cf3730f1a53f69a029ae731636821d29a6b7e1efeb971b9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7391955a2c983fdc4cf3730f1a53f69a029ae731636821d29a6b7e1efeb971b9","first_computed_at":"2026-05-18T01:20:34.531479Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:20:34.531479Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zDb6y1TOMH/RmdrxS5MXw6n3dbMZ6/AuqmB5F3Z55GDKU0eHrp0LDx3zz1S4+zmMLTaJZ9FObPKWUIFSuSEyCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:20:34.531941Z","signed_message":"canonical_sha256_bytes"},"source_id":"1508.04357","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e9148c33604443df4a8451b52e79a204b7a7f1a7e8a12ed78175222460530b0c","sha256:e4505ab06f887753b00d6e1c6b8cc8e582bab4e304dc9b7a8050c150f2f5976c"],"state_sha256":"3ad731385965370fd0922ae4dc439c5e944dbf3314c0bf908e8d93f716ba1d24"}