{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:ONCN5BHCXYFZXNJJPFYJBURNE7","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":"9b0a2bc5e7e0fb4d77fcf2f2347334e1c3b6b12c85db858caac90cd58d792792","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2012-03-08T09:34:25Z","title_canon_sha256":"36a9f15ce6324fb17b0b3d8df25bb6d0528e371c1e4056160bf1adeacbec4c2c"},"schema_version":"1.0","source":{"id":"1203.1719","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.1719","created_at":"2026-05-18T01:13:29Z"},{"alias_kind":"arxiv_version","alias_value":"1203.1719v3","created_at":"2026-05-18T01:13:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.1719","created_at":"2026-05-18T01:13:29Z"},{"alias_kind":"pith_short_12","alias_value":"ONCN5BHCXYFZ","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_16","alias_value":"ONCN5BHCXYFZXNJJ","created_at":"2026-05-18T12:27:16Z"},{"alias_kind":"pith_short_8","alias_value":"ONCN5BHC","created_at":"2026-05-18T12:27:16Z"}],"graph_snapshots":[{"event_id":"sha256:c502320fce1443c831d47e419b803d861c44d56cb38a58c5a96a7743af59063b","target":"graph","created_at":"2026-05-18T01:13:29Z","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":"We study properties of normal, superconducting (SC) and CDW states for an attractive Hubbard model on the square lattice, using a variational Monte Carlo method. In trial wave functions, we introduce an interspinon binding factor, indispensable to induce a spin-gap transition in the normal state, in addition to the onsite attractive and intersite repulsive factors. It is found that, in the normal state, as the interaction strength $|U|/t$ increases, a first-order spin-gap transition arises at $|U_{\\rm c}|\\sim W$ ($W$: band width) from a Fermi liquid to a spin-gapped state, which is conductive ","authors_text":"Hisatoshi Yokoyama, Shun Tamura","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2012-03-08T09:34:25Z","title":"Variational Monte Carlo Study of Spin-Gapped Normal State and BCS-BEC Crossover in Two-Dimensional Attractive Hubbard Model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.1719","kind":"arxiv","version":3},"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:d5c255d23b8b4203541ee74b1cead9bff4f86856ae984c91b6998aab4e3917f3","target":"record","created_at":"2026-05-18T01:13:29Z","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":"9b0a2bc5e7e0fb4d77fcf2f2347334e1c3b6b12c85db858caac90cd58d792792","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2012-03-08T09:34:25Z","title_canon_sha256":"36a9f15ce6324fb17b0b3d8df25bb6d0528e371c1e4056160bf1adeacbec4c2c"},"schema_version":"1.0","source":{"id":"1203.1719","kind":"arxiv","version":3}},"canonical_sha256":"7344de84e2be0b9bb529797090d22d27f84d15e77370dcc8fef1b3a52ef45e3b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7344de84e2be0b9bb529797090d22d27f84d15e77370dcc8fef1b3a52ef45e3b","first_computed_at":"2026-05-18T01:13:29.043474Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:13:29.043474Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qFlqFvWvsULjz0eKV+F83aM7JpyYMTCdRSEMME8KCpYjgFAoiwhL1sYP08+mdBX++7Kav6+M4mL/Ke3TvuCHDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:13:29.044086Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.1719","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d5c255d23b8b4203541ee74b1cead9bff4f86856ae984c91b6998aab4e3917f3","sha256:c502320fce1443c831d47e419b803d861c44d56cb38a58c5a96a7743af59063b"],"state_sha256":"8ec63b1b4a8ed1094ca704f32994558f377627cb6b0f8f406541293712c951eb"}