{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:SJ2G4R33YVFOGV26LWJADX6MAB","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":"386eaaec9d45064307cb5d67ac72133eecd3021ba203135385cd8e50095a56c5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-05-26T06:41:56Z","title_canon_sha256":"b9b5ed61eade2bc32e27c17613c264e0c6ee0298139ceb9b9aceff64ed3b97b3"},"schema_version":"1.0","source":{"id":"1505.06824","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.06824","created_at":"2026-05-18T00:50:09Z"},{"alias_kind":"arxiv_version","alias_value":"1505.06824v2","created_at":"2026-05-18T00:50:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.06824","created_at":"2026-05-18T00:50:09Z"},{"alias_kind":"pith_short_12","alias_value":"SJ2G4R33YVFO","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_16","alias_value":"SJ2G4R33YVFOGV26","created_at":"2026-05-18T12:29:42Z"},{"alias_kind":"pith_short_8","alias_value":"SJ2G4R33","created_at":"2026-05-18T12:29:42Z"}],"graph_snapshots":[{"event_id":"sha256:f7361d6c50a58cf0946c5bc703a9724a78cfa438247eb33bf07af080823bd446","target":"graph","created_at":"2026-05-18T00:50:09Z","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 possible emergence of a spin liquid phase in the half-filled Hubbard model on the honeycomb lattice; a simple model of graphene, is studied using the variational cluster approximation. We found that the critical interaction strength of a magnetic transition is slightly lower than that of the non-magnetic metal-to-insulator transition. Thus a semi-metallic state becomes a magnetic insulator as the interaction strength increases and a non-magnetic insulating state does not occur. Therefore a spin liquid state characterized by an insulating state without long range order, is not realized in t","authors_text":"Atsushi Yamada","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-05-26T06:41:56Z","title":"Absence of Spin Liquid in the Hubbard model on the Honeycomb Lattice"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.06824","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":"sha256:13769e1936a88c6979fcb74d56b8551fb67ae00c31c9689faf3ae7463010156c","target":"record","created_at":"2026-05-18T00:50:09Z","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":"386eaaec9d45064307cb5d67ac72133eecd3021ba203135385cd8e50095a56c5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-05-26T06:41:56Z","title_canon_sha256":"b9b5ed61eade2bc32e27c17613c264e0c6ee0298139ceb9b9aceff64ed3b97b3"},"schema_version":"1.0","source":{"id":"1505.06824","kind":"arxiv","version":2}},"canonical_sha256":"92746e477bc54ae3575e5d9201dfcc007a9508fc3708bdf4e42f1fb53c1438bd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"92746e477bc54ae3575e5d9201dfcc007a9508fc3708bdf4e42f1fb53c1438bd","first_computed_at":"2026-05-18T00:50:09.929270Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:50:09.929270Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Krq9jeP+bHv1nbv54UriWlKgIXasQW8wYpmA8BWmDR5RH7ZQFQDsrftXiu2+IFmKs4yhiKYhnSROEwUnPgOaDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:50:09.929958Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.06824","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:13769e1936a88c6979fcb74d56b8551fb67ae00c31c9689faf3ae7463010156c","sha256:f7361d6c50a58cf0946c5bc703a9724a78cfa438247eb33bf07af080823bd446"],"state_sha256":"c1db9088244285a96c442e488c86b1145b1b1c57056d96fa6a3e007221bd5986"}