{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:6LL4X65EX7OHTNQNRNDJV4YSU5","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":"715c9be9a391b214071f6bc381f42e31cd6388792e3862621334958b4fd9d8ba","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2014-06-29T09:13:13Z","title_canon_sha256":"f290cf31ddc4710b8a8ab045a792d4996f659834c58939ab913786a0b5ccf1cb"},"schema_version":"1.0","source":{"id":"1406.7477","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.7477","created_at":"2026-05-18T02:41:09Z"},{"alias_kind":"arxiv_version","alias_value":"1406.7477v2","created_at":"2026-05-18T02:41:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.7477","created_at":"2026-05-18T02:41:09Z"},{"alias_kind":"pith_short_12","alias_value":"6LL4X65EX7OH","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_16","alias_value":"6LL4X65EX7OHTNQN","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_8","alias_value":"6LL4X65E","created_at":"2026-05-18T12:28:16Z"}],"graph_snapshots":[{"event_id":"sha256:1b65198595035bb6b1c85379903876b4f4c509bd11eccc08a5354d1b2501470d","target":"graph","created_at":"2026-05-18T02:41:09Z","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":"We study Renyi and von Neumann entanglement entropies in the ground state of the one dimensional quarter-filled Hubbard model with periodic boundary conditions. We show that they exhibit an unexpected dependence on system size: for L=4 mod 8 the results are in agreement with expectations based on conformal field theory, while for L=0 mod 8 additional contributions arise. We show that these can be understood in terms of a \"shell-filling\" effect, and we develop a conformal field theory approach to calculate the additional contributions to the entropies. These analytic results are found to be in ","authors_text":"Andreas M. Lauchli, Fabian H. L. Essler, Pasquale Calabrese","cross_cats":["cond-mat.stat-mech"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2014-06-29T09:13:13Z","title":"Entanglement Entropies of the quarter filled Hubbard model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.7477","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:dd6774abe2c76a94d9bf51a1a4e536856fb14abc382a73fd6e52a2f73cb0d30f","target":"record","created_at":"2026-05-18T02:41:09Z","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":"715c9be9a391b214071f6bc381f42e31cd6388792e3862621334958b4fd9d8ba","cross_cats_sorted":["cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2014-06-29T09:13:13Z","title_canon_sha256":"f290cf31ddc4710b8a8ab045a792d4996f659834c58939ab913786a0b5ccf1cb"},"schema_version":"1.0","source":{"id":"1406.7477","kind":"arxiv","version":2}},"canonical_sha256":"f2d7cbfba4bfdc79b60d8b469af312a74aa0f55d80182e8931318944da7e50f4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f2d7cbfba4bfdc79b60d8b469af312a74aa0f55d80182e8931318944da7e50f4","first_computed_at":"2026-05-18T02:41:09.998979Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:41:09.998979Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SOVwrmBVT4ueK8d/xM5ycfPhFBItfC8HaNoWryNGE3a+CZyVfScakvrb/qp58FnwqaVUo6mrhjuyw9XC3afAAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:41:09.999464Z","signed_message":"canonical_sha256_bytes"},"source_id":"1406.7477","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dd6774abe2c76a94d9bf51a1a4e536856fb14abc382a73fd6e52a2f73cb0d30f","sha256:1b65198595035bb6b1c85379903876b4f4c509bd11eccc08a5354d1b2501470d"],"state_sha256":"28271003901d04905f74b8a532982b8005c305151b207670dffd16020fae1107"}