{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:KTA7VWZ5PIOXJJDFUURLRCVUZ5","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":"8555f61afa5683f496da9e9b3c8254fab8efca904c5003a0d37436e339abe9ae","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2012-02-06T19:37:14Z","title_canon_sha256":"83c6fe9eee853c241ddedba02572c3b8d91c21cd58f60bf9a695dd89e9ed919c"},"schema_version":"1.0","source":{"id":"1202.1249","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.1249","created_at":"2026-05-18T03:14:17Z"},{"alias_kind":"arxiv_version","alias_value":"1202.1249v2","created_at":"2026-05-18T03:14:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.1249","created_at":"2026-05-18T03:14:17Z"},{"alias_kind":"pith_short_12","alias_value":"KTA7VWZ5PIOX","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_16","alias_value":"KTA7VWZ5PIOXJJDF","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_8","alias_value":"KTA7VWZ5","created_at":"2026-05-18T12:27:11Z"}],"graph_snapshots":[{"event_id":"sha256:6eed6c92f365583dd2824b11c867319263f98e0174db93b4529cdc62471631ee","target":"graph","created_at":"2026-05-18T03:14:17Z","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 effect of exposure to atmospheric conditions on the THz conductivity of thin films of the topological insulator Bi$_2$Se$_3$. We find: 1) two contributions of mobile charge carriers to the THz conductivity immediately after growth, and 2) the spectral weight of the smaller of these decays significantly over a period of several days as the film is exposed to ambient conditions, while the other remains relatively constant. We associate the former with a bulk response, and the latter with the surface. The surface response exhibits the expected robustness of the carriers from 2D t","authors_text":"A. V. Stier, L. S. Bilbro, L. Wu, M. Brahlek, N. Bansal, N. P. Armitage, R. Vald\\'es Aguilar, S. Oh","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2012-02-06T19:37:14Z","title":"Aging and reduced bulk conductance in thin films of the topological insulator Bi$_2$Se$_3$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.1249","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:c90614ff34028103b2ec335763316036493c44624369c20c43b7f76d5488d256","target":"record","created_at":"2026-05-18T03:14:17Z","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":"8555f61afa5683f496da9e9b3c8254fab8efca904c5003a0d37436e339abe9ae","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2012-02-06T19:37:14Z","title_canon_sha256":"83c6fe9eee853c241ddedba02572c3b8d91c21cd58f60bf9a695dd89e9ed919c"},"schema_version":"1.0","source":{"id":"1202.1249","kind":"arxiv","version":2}},"canonical_sha256":"54c1fadb3d7a1d74a465a522b88ab4cf766ffe8d80ccca154895dfb08b5d44bd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"54c1fadb3d7a1d74a465a522b88ab4cf766ffe8d80ccca154895dfb08b5d44bd","first_computed_at":"2026-05-18T03:14:17.668673Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:14:17.668673Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Y640FNn5RCNenbnjqxkoxhklVQV1A+l4303z53dUce4DmKknmoDJ1kNHrMXmHZBIaR/G61vPJIQ4AFKDLvKqDA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:14:17.669533Z","signed_message":"canonical_sha256_bytes"},"source_id":"1202.1249","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c90614ff34028103b2ec335763316036493c44624369c20c43b7f76d5488d256","sha256:6eed6c92f365583dd2824b11c867319263f98e0174db93b4529cdc62471631ee"],"state_sha256":"0544896a0d65615840212424857b71174cec20f878614e3e4fa5c48a7631b2e7"}