{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:UNF3QSDHAV7ZWNVVBVVGHCBWQK","short_pith_number":"pith:UNF3QSDH","canonical_record":{"source":{"id":"1811.07529","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-11-19T07:16:04Z","cross_cats_sorted":[],"title_canon_sha256":"a3ee8b0d01a80e9bb854a5fcc34d6fe3059b1dc1e4a2bdf90eba269602ed10f9","abstract_canon_sha256":"f616c7135efced512f55c31accb9a6a586b19e9989d8398041605223f61cc334"},"schema_version":"1.0"},"canonical_sha256":"a34bb84867057f9b36b50d6a638836829b7d1ea16b1d6b39b6ee9b44d9678b49","source":{"kind":"arxiv","id":"1811.07529","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.07529","created_at":"2026-05-17T23:51:48Z"},{"alias_kind":"arxiv_version","alias_value":"1811.07529v2","created_at":"2026-05-17T23:51:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.07529","created_at":"2026-05-17T23:51:48Z"},{"alias_kind":"pith_short_12","alias_value":"UNF3QSDHAV7Z","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"UNF3QSDHAV7ZWNVV","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"UNF3QSDH","created_at":"2026-05-18T12:32:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:UNF3QSDHAV7ZWNVVBVVGHCBWQK","target":"record","payload":{"canonical_record":{"source":{"id":"1811.07529","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-11-19T07:16:04Z","cross_cats_sorted":[],"title_canon_sha256":"a3ee8b0d01a80e9bb854a5fcc34d6fe3059b1dc1e4a2bdf90eba269602ed10f9","abstract_canon_sha256":"f616c7135efced512f55c31accb9a6a586b19e9989d8398041605223f61cc334"},"schema_version":"1.0"},"canonical_sha256":"a34bb84867057f9b36b50d6a638836829b7d1ea16b1d6b39b6ee9b44d9678b49","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:51:48.880758Z","signature_b64":"ylhPpI25mcUp1t1xvRjZprFPCcigAmmhiynhR0K9ueOgIvbliFfQLopSqm2F3TVVPWw8gDZfTJYY8GTCWngqAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a34bb84867057f9b36b50d6a638836829b7d1ea16b1d6b39b6ee9b44d9678b49","last_reissued_at":"2026-05-17T23:51:48.880103Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:51:48.880103Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.07529","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:51:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9MOBStYL+eyI76SkN7AV+J757HFDvtoFSlU245KNBmSF3c2aUBVUeCk+E0pvnoOY6BC1Ua6uc6K+LzhLi+xFDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T10:08:15.312852Z"},"content_sha256":"bb2edee9fd5daa550766eaf8a2a3f8e7d22d9cad05e059ead69b62083d49ce9c","schema_version":"1.0","event_id":"sha256:bb2edee9fd5daa550766eaf8a2a3f8e7d22d9cad05e059ead69b62083d49ce9c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:UNF3QSDHAV7ZWNVVBVVGHCBWQK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical conductivity of black phosphorus with a tunable electronic structure","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Hongki Min, Jiho Jang, Seongjin Ahn","submitted_at":"2018-11-19T07:16:04Z","abstract_excerpt":"Black phosphorus (BP) is a two-dimensional layered material composed of phosphorus atoms. Recently, it was demonstrated that external perturbations such as an electric field close the band gap in few-layer BP, and can even induce a band inversion, resulting in an insulator phase with a finite energy gap or a Dirac semimetal phase characterized by two separate Dirac nodes. At the transition between the two phases, a semi-Dirac state appears in which energy disperses linearly along one direction and quadratically along the other. In this work, we study the optical conductivity of few-layer BP us"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.07529","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:51:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kjaf0y4Af2HOUnVhWcMuONTxxyEzXm2irDCrqbGUOPPlAhQrpQAPHRpa/rqs5CBjcq9o+0kkewbVXnKjZynEAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T10:08:15.313192Z"},"content_sha256":"8e79b5781d2e49edb790c7772e608bb78bbc4f27275697498f8a64d3f1d6c68a","schema_version":"1.0","event_id":"sha256:8e79b5781d2e49edb790c7772e608bb78bbc4f27275697498f8a64d3f1d6c68a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UNF3QSDHAV7ZWNVVBVVGHCBWQK/bundle.json","state_url":"https://pith.science/pith/UNF3QSDHAV7ZWNVVBVVGHCBWQK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UNF3QSDHAV7ZWNVVBVVGHCBWQK/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-12T10:08:15Z","links":{"resolver":"https://pith.science/pith/UNF3QSDHAV7ZWNVVBVVGHCBWQK","bundle":"https://pith.science/pith/UNF3QSDHAV7ZWNVVBVVGHCBWQK/bundle.json","state":"https://pith.science/pith/UNF3QSDHAV7ZWNVVBVVGHCBWQK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UNF3QSDHAV7ZWNVVBVVGHCBWQK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:UNF3QSDHAV7ZWNVVBVVGHCBWQK","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":"f616c7135efced512f55c31accb9a6a586b19e9989d8398041605223f61cc334","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-11-19T07:16:04Z","title_canon_sha256":"a3ee8b0d01a80e9bb854a5fcc34d6fe3059b1dc1e4a2bdf90eba269602ed10f9"},"schema_version":"1.0","source":{"id":"1811.07529","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.07529","created_at":"2026-05-17T23:51:48Z"},{"alias_kind":"arxiv_version","alias_value":"1811.07529v2","created_at":"2026-05-17T23:51:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.07529","created_at":"2026-05-17T23:51:48Z"},{"alias_kind":"pith_short_12","alias_value":"UNF3QSDHAV7Z","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"UNF3QSDHAV7ZWNVV","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"UNF3QSDH","created_at":"2026-05-18T12:32:56Z"}],"graph_snapshots":[{"event_id":"sha256:8e79b5781d2e49edb790c7772e608bb78bbc4f27275697498f8a64d3f1d6c68a","target":"graph","created_at":"2026-05-17T23:51:48Z","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":"Black phosphorus (BP) is a two-dimensional layered material composed of phosphorus atoms. Recently, it was demonstrated that external perturbations such as an electric field close the band gap in few-layer BP, and can even induce a band inversion, resulting in an insulator phase with a finite energy gap or a Dirac semimetal phase characterized by two separate Dirac nodes. At the transition between the two phases, a semi-Dirac state appears in which energy disperses linearly along one direction and quadratically along the other. In this work, we study the optical conductivity of few-layer BP us","authors_text":"Hongki Min, Jiho Jang, Seongjin Ahn","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-11-19T07:16:04Z","title":"Optical conductivity of black phosphorus with a tunable electronic structure"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.07529","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:bb2edee9fd5daa550766eaf8a2a3f8e7d22d9cad05e059ead69b62083d49ce9c","target":"record","created_at":"2026-05-17T23:51:48Z","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":"f616c7135efced512f55c31accb9a6a586b19e9989d8398041605223f61cc334","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-11-19T07:16:04Z","title_canon_sha256":"a3ee8b0d01a80e9bb854a5fcc34d6fe3059b1dc1e4a2bdf90eba269602ed10f9"},"schema_version":"1.0","source":{"id":"1811.07529","kind":"arxiv","version":2}},"canonical_sha256":"a34bb84867057f9b36b50d6a638836829b7d1ea16b1d6b39b6ee9b44d9678b49","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a34bb84867057f9b36b50d6a638836829b7d1ea16b1d6b39b6ee9b44d9678b49","first_computed_at":"2026-05-17T23:51:48.880103Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:51:48.880103Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ylhPpI25mcUp1t1xvRjZprFPCcigAmmhiynhR0K9ueOgIvbliFfQLopSqm2F3TVVPWw8gDZfTJYY8GTCWngqAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:51:48.880758Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.07529","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bb2edee9fd5daa550766eaf8a2a3f8e7d22d9cad05e059ead69b62083d49ce9c","sha256:8e79b5781d2e49edb790c7772e608bb78bbc4f27275697498f8a64d3f1d6c68a"],"state_sha256":"091cd7b826e04df0fe267af80ceb4969c753210ceec60cbce8aa8fbc4ae5686a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UMYfDAykd8jJSQBLlAajfW/nQYMKZvuOwxMgorbCGRZjvIgxbPcNwEjDmARIAtXaS/jOi87gqEHiuQRHWMuvDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-12T10:08:15.315133Z","bundle_sha256":"f72536b9b0df8020957c0d8cc3748d9d892bbfcf2c5adb7f249420ebec23bad8"}}