{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:I42ALQSZTDZRXQ64E7DA5QYVMW","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":"d443c42202228431bb12d6fd3096ec18a557b83a590ab0d54c900620d850d7b0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-12-24T19:09:12Z","title_canon_sha256":"2e484cf03c81b9227cb319d23743895f8cd581bbc283d1b0c2d64baf63f98ad0"},"schema_version":"1.0","source":{"id":"0912.4897","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0912.4897","created_at":"2026-05-18T02:10:13Z"},{"alias_kind":"arxiv_version","alias_value":"0912.4897v1","created_at":"2026-05-18T02:10:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.4897","created_at":"2026-05-18T02:10:13Z"},{"alias_kind":"pith_short_12","alias_value":"I42ALQSZTDZR","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"I42ALQSZTDZRXQ64","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"I42ALQSZ","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:ecd6bf7b79e0e8ed3fcc989297badeca990687cc9cb0b95d3221b0fbdcd8fb34","target":"graph","created_at":"2026-05-18T02:10:13Z","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 model for charge transport in undoped, photo-excited semiconductor superlattices, which includes the dependence of the electron-hole recombination on the electric field and on the photo-excitation intensity through the field-dependent recombination coefficient, is proposed and analyzed. Under dc voltage bias and high photo-excitation intensities, there appear self-sustained oscillations of the current due to a repeated homogeneous nucleation of a number of charge dipole waves inside the superlattice. In contrast to the case of a constant recombination coefficient, nucleated dipole waves can ","authors_text":"H.T. Grahn, J.I. Arana, L.L. Bonilla","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-12-24T19:09:12Z","title":"Photo-excited semiconductor superlattices as constrained excitable media: Motion of dipole domains and current self-oscillations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.4897","kind":"arxiv","version":1},"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":"sha256:551cdbc605e8ade4beb61ac26f829f64e48b7cef811d54582e28e8a19c76c02c","target":"record","created_at":"2026-05-18T02:10:13Z","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":"d443c42202228431bb12d6fd3096ec18a557b83a590ab0d54c900620d850d7b0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-12-24T19:09:12Z","title_canon_sha256":"2e484cf03c81b9227cb319d23743895f8cd581bbc283d1b0c2d64baf63f98ad0"},"schema_version":"1.0","source":{"id":"0912.4897","kind":"arxiv","version":1}},"canonical_sha256":"473405c25998f31bc3dc27c60ec31565b81cde43382d7d9d296fda8d75ea6451","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"473405c25998f31bc3dc27c60ec31565b81cde43382d7d9d296fda8d75ea6451","first_computed_at":"2026-05-18T02:10:13.808387Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:10:13.808387Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XSKmqSwgG2TCQ0ZWqkYbUPGrYlAEdeX7muq6wvMDUqpwCq83QicqH+VGqUULuXNPBSOT+l3lX5uA/BdTknnCBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:10:13.809214Z","signed_message":"canonical_sha256_bytes"},"source_id":"0912.4897","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:551cdbc605e8ade4beb61ac26f829f64e48b7cef811d54582e28e8a19c76c02c","sha256:ecd6bf7b79e0e8ed3fcc989297badeca990687cc9cb0b95d3221b0fbdcd8fb34"],"state_sha256":"8f1af2da21866098da6fd2d6f524bd55df6a3455c38df803f4b33070535ccaec"}