{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:SSUMSRDML6K5QO3GSMJCY7A2G2","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":"4c1e661f5cc3f7ab09b86d1224cfa1cdd6d9dffcdafa584e2ba29ce6f79062da","cross_cats_sorted":["cond-mat.stat-mech","cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2016-04-01T01:23:00Z","title_canon_sha256":"06bbfa2d536d1295cca2c358647a419f19a8dcef8f0ca6758a1023d088f59407"},"schema_version":"1.0","source":{"id":"1604.00096","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.00096","created_at":"2026-05-18T01:12:24Z"},{"alias_kind":"arxiv_version","alias_value":"1604.00096v3","created_at":"2026-05-18T01:12:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.00096","created_at":"2026-05-18T01:12:24Z"},{"alias_kind":"pith_short_12","alias_value":"SSUMSRDML6K5","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"SSUMSRDML6K5QO3G","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"SSUMSRDM","created_at":"2026-05-18T12:30:44Z"}],"graph_snapshots":[{"event_id":"sha256:8074533b197184e2ad3611e90c54b3f5b543dc049609a14894e07b55fa1e93a7","target":"graph","created_at":"2026-05-18T01:12:24Z","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 report on the site-resolved observation of characteristic states of the two-dimensional repulsive Fermi-Hubbard model, using ultracold $^{40}$K atoms in an optical lattice. By varying the tunneling, interaction strength, and external confinement, we realize metallic, Mott-insulating, and band-insulating states. We directly measure the local moment, which quantifies the degree of on-site magnetization, as a function of temperature and chemical potential. Entropies per particle as low as $0.99(6)\\,k_B$ indicate that nearest-neighbor antiferromagnetic correlations should be detectable using sp","authors_text":"Hao Zhang, Katherine R. Lawrence, Lawrence W. Cheuk, Martin W. Zwierlein, Matthew A. Nichols, Melih Okan","cross_cats":["cond-mat.stat-mech","cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2016-04-01T01:23:00Z","title":"Observation of 2D fermionic Mott insulators of $^{40}$K with single-site resolution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.00096","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":"sha256:12a509fe7c1775bb842936ddac2f9d98acced37fc5a9cba3729449b9d247db93","target":"record","created_at":"2026-05-18T01:12:24Z","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":"4c1e661f5cc3f7ab09b86d1224cfa1cdd6d9dffcdafa584e2ba29ce6f79062da","cross_cats_sorted":["cond-mat.stat-mech","cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2016-04-01T01:23:00Z","title_canon_sha256":"06bbfa2d536d1295cca2c358647a419f19a8dcef8f0ca6758a1023d088f59407"},"schema_version":"1.0","source":{"id":"1604.00096","kind":"arxiv","version":3}},"canonical_sha256":"94a8c9446c5f95d83b6693122c7c1a369889bad758a4af541a475ea182a02f91","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"94a8c9446c5f95d83b6693122c7c1a369889bad758a4af541a475ea182a02f91","first_computed_at":"2026-05-18T01:12:24.964159Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:12:24.964159Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rMPniEgD6u3mPNZzUhDDcAMqCIEx0CRwTGw2/ngF0KlgAphoDguanONGvqpmFSK8SKSnRrvggCL97w22QXm6BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:12:24.964552Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.00096","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:12a509fe7c1775bb842936ddac2f9d98acced37fc5a9cba3729449b9d247db93","sha256:8074533b197184e2ad3611e90c54b3f5b543dc049609a14894e07b55fa1e93a7"],"state_sha256":"9d0526c64a2bd9306ff475512809558b2f89a8d4c4087427f810dd1aa74a1f18"}