{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:7O6CCESYB4PTMASOSQRREMNQJC","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":"52914ecf895d6ef970c552d2620808e2989c5dc3147feff104977fb69e158928","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.mtrl-sci","submitted_at":"1999-09-14T09:54:42Z","title_canon_sha256":"dd4441fb084b1096e30a561d00faf95cb5a6b0b1bc40b6d5e0a1061ec773df5b"},"schema_version":"1.0","source":{"id":"cond-mat/9909201","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/9909201","created_at":"2026-07-04T16:13:16Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/9909201v2","created_at":"2026-07-04T16:13:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/9909201","created_at":"2026-07-04T16:13:16Z"},{"alias_kind":"pith_short_12","alias_value":"7O6CCESYB4PT","created_at":"2026-07-04T16:13:16Z"},{"alias_kind":"pith_short_16","alias_value":"7O6CCESYB4PTMASO","created_at":"2026-07-04T16:13:16Z"},{"alias_kind":"pith_short_8","alias_value":"7O6CCESY","created_at":"2026-07-04T16:13:16Z"}],"graph_snapshots":[{"event_id":"sha256:e47bcbfb86def9e011030addb33e31400ffaf6bae350a55385dc84accd0e1c59","target":"graph","created_at":"2026-07-04T16:13:16Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/cond-mat/9909201/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The photoconductivity of GaAs structures delta-doped by Sn has been investigated for wavelengths lambda= 650-1200 nm in the temperature interval T= 4.2-300 K. The electron densities and mobilities, before and after illumination, have been determined by magnetoresistance, Shubnikov-de Haas effect and Hall effect measurements, in high magnetic fields. For the heavily doped structures (n_H> 2x10^13 cm^-2) we observe under illumination by light with wavelengths larger than the band-gap wavelength of the host material (lambda= 815 nm at T= 4.2 K) first positive (PPPC) and then negative (NPPC) persi","authors_text":"A. de Visser, A.P. Senichkin, A.S. Bugaev, A.V. Golikov, R.A. Lunin, R.T.F. van Schaijk, V.A. Kulbachinskii, V.G. Kytin","cross_cats":[],"headline":"","license":"","primary_cat":"cond-mat.mtrl-sci","submitted_at":"1999-09-14T09:54:42Z","title":"Wavelength dependent negative and positive persistent photoconductivity in Sn delta-doped GaAs structures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/9909201","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:bb4a0eddfa953f7c86334797b9f0da232117b123d7741beb7a5feddd6e604e0e","target":"record","created_at":"2026-07-04T16:13:16Z","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":"52914ecf895d6ef970c552d2620808e2989c5dc3147feff104977fb69e158928","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.mtrl-sci","submitted_at":"1999-09-14T09:54:42Z","title_canon_sha256":"dd4441fb084b1096e30a561d00faf95cb5a6b0b1bc40b6d5e0a1061ec773df5b"},"schema_version":"1.0","source":{"id":"cond-mat/9909201","kind":"arxiv","version":2}},"canonical_sha256":"fbbc2112580f1f36024e94231231b048bf079ad2f8de26dfd48f2d73bf2eb9d1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fbbc2112580f1f36024e94231231b048bf079ad2f8de26dfd48f2d73bf2eb9d1","first_computed_at":"2026-07-04T16:13:16.522541Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:13:16.522541Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RZqxiclQAaIm+M61dh9zbSINdz1ouR6LJLVBUo+X5ldnvJ5lCWZg6NLAYRNghKr5gUrDfEUSTljdr5BrIofCDA==","signature_status":"signed_v1","signed_at":"2026-07-04T16:13:16.522951Z","signed_message":"canonical_sha256_bytes"},"source_id":"cond-mat/9909201","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bb4a0eddfa953f7c86334797b9f0da232117b123d7741beb7a5feddd6e604e0e","sha256:e47bcbfb86def9e011030addb33e31400ffaf6bae350a55385dc84accd0e1c59"],"state_sha256":"85aa9e050913612ad2fca2c7e9d64215df22fa665ea0a63451000953b51cf3f3"}