{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:ECLJ6KHZMRE6J2NYBWSVYCSZIC","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":"af47a03f73ebc19725fef5cddf69348183ac76567a5485fbec73608e583b9fe3","cross_cats_sorted":["hep-th","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-04-01T20:00:56Z","title_canon_sha256":"65688a5e03775148162bc8774e28b4b437ca9ba30c824c3c6937a61386a72ef5"},"schema_version":"1.0","source":{"id":"1504.00369","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.00369","created_at":"2026-05-18T01:19:48Z"},{"alias_kind":"arxiv_version","alias_value":"1504.00369v3","created_at":"2026-05-18T01:19:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.00369","created_at":"2026-05-18T01:19:48Z"},{"alias_kind":"pith_short_12","alias_value":"ECLJ6KHZMRE6","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"ECLJ6KHZMRE6J2NY","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"ECLJ6KHZ","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:83e44e07d99e9c126c782924515c58dbed2992e1dc9ee961fb4c562378e2ae9f","target":"graph","created_at":"2026-05-18T01:19:48Z","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":"A hallmark feature of topological physics is the presence of one-way propagating chiral modes at the system boundary. The chirality of edge modes is a consequence of the topological character of the bulk. For example, in a non-interacting quantum Hall model, edge modes manifest as mid-gap states between two topologically distinct bulk bands. The bulk-boundary correspondence dictates that the number of chiral edge modes, a topological invariant called the winding number, is completely determined by the bulk topological invariant, the Chern number. Here, for the first time, we measure the windin","authors_text":"Abolhassan Vaezi, Jingyun Fan, Mohammad Hafezi, Sriram Ganeshan, Sunil Mittal","cross_cats":["hep-th","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-04-01T20:00:56Z","title":"Measurement of topological invariants in a 2D photonic system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.00369","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":"sha256:34fc75665c5df39f237001dccfb85bd2ffe1c17cae566df5ce3e839346ac14e9","target":"record","created_at":"2026-05-18T01:19:48Z","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":"af47a03f73ebc19725fef5cddf69348183ac76567a5485fbec73608e583b9fe3","cross_cats_sorted":["hep-th","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-04-01T20:00:56Z","title_canon_sha256":"65688a5e03775148162bc8774e28b4b437ca9ba30c824c3c6937a61386a72ef5"},"schema_version":"1.0","source":{"id":"1504.00369","kind":"arxiv","version":3}},"canonical_sha256":"20969f28f96449e4e9b80da55c0a5940ae120c5cb7bcf9273ddcbefaf5240b2c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"20969f28f96449e4e9b80da55c0a5940ae120c5cb7bcf9273ddcbefaf5240b2c","first_computed_at":"2026-05-18T01:19:48.570910Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:48.570910Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"U/TSqSBcSATyxgOtQbSPvMe/kHhyb0lWLVADShbgIwHWHoKujlhwkvSEBjg/MERPDnKdPfxcT/aOX1KHpBVwBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:48.571305Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.00369","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:34fc75665c5df39f237001dccfb85bd2ffe1c17cae566df5ce3e839346ac14e9","sha256:83e44e07d99e9c126c782924515c58dbed2992e1dc9ee961fb4c562378e2ae9f"],"state_sha256":"666f126f03322ef5eca4640504144cf2c6c6bcfd8fd9c962175d40c5dca6ad3b"}