{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:IOCNA2BBPI33QHTCW5G4SFKY5T","short_pith_number":"pith:IOCNA2BB","canonical_record":{"source":{"id":"2104.00478","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-01T14:07:28Z","cross_cats_sorted":[],"title_canon_sha256":"fa307cc73c9fe1fdb99beecad6aa0bf5db84ccab2c376c5bdc9a143fc7943b78","abstract_canon_sha256":"9b1a9c6ffab1dd5cb9cf28b73e8683e81fd681ee06aaf4905d6d3d968c0b4520"},"schema_version":"1.0"},"canonical_sha256":"4384d068217a37b81e62b74dc91558eccb2c199e76d8b67967c6a32e74ea831b","source":{"kind":"arxiv","id":"2104.00478","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.00478","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"arxiv_version","alias_value":"2104.00478v1","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.00478","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"pith_short_12","alias_value":"IOCNA2BBPI33","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"pith_short_16","alias_value":"IOCNA2BBPI33QHTC","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"pith_short_8","alias_value":"IOCNA2BB","created_at":"2026-07-05T02:34:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:IOCNA2BBPI33QHTCW5G4SFKY5T","target":"record","payload":{"canonical_record":{"source":{"id":"2104.00478","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-01T14:07:28Z","cross_cats_sorted":[],"title_canon_sha256":"fa307cc73c9fe1fdb99beecad6aa0bf5db84ccab2c376c5bdc9a143fc7943b78","abstract_canon_sha256":"9b1a9c6ffab1dd5cb9cf28b73e8683e81fd681ee06aaf4905d6d3d968c0b4520"},"schema_version":"1.0"},"canonical_sha256":"4384d068217a37b81e62b74dc91558eccb2c199e76d8b67967c6a32e74ea831b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:34:48.308842Z","signature_b64":"GhMZ0JRdunbnESvCmv6VQpNTy8HM8ZXCJEhGbvayiBtNIAtnbCxtjGQxtyHU7fdPbPtQpkHCR2NVTzTSvG20Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4384d068217a37b81e62b74dc91558eccb2c199e76d8b67967c6a32e74ea831b","last_reissued_at":"2026-07-05T02:34:48.308398Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:34:48.308398Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.00478","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:34:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dkDK3XV7rwKyc591jDXqm/WQWPPnC2L4LOaDhLocZ8M08HMTtaxh55UwWYkuJfQ9k8B12iW4QvLa5VwWPKw+Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-18T08:31:34.245813Z"},"content_sha256":"740813071d4d9e3707155a25bf3e3b2b0739d27cb90c4ecc41f8c773821e2e0b","schema_version":"1.0","event_id":"sha256:740813071d4d9e3707155a25bf3e3b2b0739d27cb90c4ecc41f8c773821e2e0b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:IOCNA2BBPI33QHTCW5G4SFKY5T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Chemical bonding and Born charge in 1T-HfS$_2$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Janice L. Musfeldt, Sabine N. Neal, Shutong Li, Turan Birol","submitted_at":"2021-04-01T14:07:28Z","abstract_excerpt":"We combine infrared absorption and Raman scattering spectroscopies to explore the properties of the heavy transition metal dichalcogenide 1T-HfS$_2$. We employ the LO-TO splitting of the $E_u$ vibrational mode along with a reevaluation of mode mass, unit cell volume, and dielectric constant to reveal the Born effective charge. We find $Z^*_{\\rm{B}}$ = 5.3$e$, in excellent agreement with complementary first principles calculations. In addition to resolving controversy over the nature of chemical bonding in this system, we decompose Born charge into polarizability and local charge. We find $\\alp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.00478","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2104.00478/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T02:34:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PlInRFGCLh8tbjidlwQhB4meY4V2iRZ6dgXYVYZSI64XVzKmUOrYVZgWv204gjPHuEkda1m5vgQYhxWX0wDJBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-18T08:31:34.246215Z"},"content_sha256":"16b571f0c143c6d27137e2952c5ff9bac6b3ff21c6648202a8eccbbc2260fde9","schema_version":"1.0","event_id":"sha256:16b571f0c143c6d27137e2952c5ff9bac6b3ff21c6648202a8eccbbc2260fde9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IOCNA2BBPI33QHTCW5G4SFKY5T/bundle.json","state_url":"https://pith.science/pith/IOCNA2BBPI33QHTCW5G4SFKY5T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IOCNA2BBPI33QHTCW5G4SFKY5T/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":"2026-07-18T08:31:34Z","links":{"resolver":"https://pith.science/pith/IOCNA2BBPI33QHTCW5G4SFKY5T","bundle":"https://pith.science/pith/IOCNA2BBPI33QHTCW5G4SFKY5T/bundle.json","state":"https://pith.science/pith/IOCNA2BBPI33QHTCW5G4SFKY5T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IOCNA2BBPI33QHTCW5G4SFKY5T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:IOCNA2BBPI33QHTCW5G4SFKY5T","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":"9b1a9c6ffab1dd5cb9cf28b73e8683e81fd681ee06aaf4905d6d3d968c0b4520","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-01T14:07:28Z","title_canon_sha256":"fa307cc73c9fe1fdb99beecad6aa0bf5db84ccab2c376c5bdc9a143fc7943b78"},"schema_version":"1.0","source":{"id":"2104.00478","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.00478","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"arxiv_version","alias_value":"2104.00478v1","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.00478","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"pith_short_12","alias_value":"IOCNA2BBPI33","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"pith_short_16","alias_value":"IOCNA2BBPI33QHTC","created_at":"2026-07-05T02:34:48Z"},{"alias_kind":"pith_short_8","alias_value":"IOCNA2BB","created_at":"2026-07-05T02:34:48Z"}],"graph_snapshots":[{"event_id":"sha256:16b571f0c143c6d27137e2952c5ff9bac6b3ff21c6648202a8eccbbc2260fde9","target":"graph","created_at":"2026-07-05T02:34:48Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2104.00478/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We combine infrared absorption and Raman scattering spectroscopies to explore the properties of the heavy transition metal dichalcogenide 1T-HfS$_2$. We employ the LO-TO splitting of the $E_u$ vibrational mode along with a reevaluation of mode mass, unit cell volume, and dielectric constant to reveal the Born effective charge. We find $Z^*_{\\rm{B}}$ = 5.3$e$, in excellent agreement with complementary first principles calculations. In addition to resolving controversy over the nature of chemical bonding in this system, we decompose Born charge into polarizability and local charge. We find $\\alp","authors_text":"Janice L. Musfeldt, Sabine N. Neal, Shutong Li, Turan Birol","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-01T14:07:28Z","title":"Chemical bonding and Born charge in 1T-HfS$_2$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.00478","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":"sha256:740813071d4d9e3707155a25bf3e3b2b0739d27cb90c4ecc41f8c773821e2e0b","target":"record","created_at":"2026-07-05T02:34:48Z","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":"9b1a9c6ffab1dd5cb9cf28b73e8683e81fd681ee06aaf4905d6d3d968c0b4520","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-01T14:07:28Z","title_canon_sha256":"fa307cc73c9fe1fdb99beecad6aa0bf5db84ccab2c376c5bdc9a143fc7943b78"},"schema_version":"1.0","source":{"id":"2104.00478","kind":"arxiv","version":1}},"canonical_sha256":"4384d068217a37b81e62b74dc91558eccb2c199e76d8b67967c6a32e74ea831b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4384d068217a37b81e62b74dc91558eccb2c199e76d8b67967c6a32e74ea831b","first_computed_at":"2026-07-05T02:34:48.308398Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:34:48.308398Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GhMZ0JRdunbnESvCmv6VQpNTy8HM8ZXCJEhGbvayiBtNIAtnbCxtjGQxtyHU7fdPbPtQpkHCR2NVTzTSvG20Bw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:34:48.308842Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.00478","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:740813071d4d9e3707155a25bf3e3b2b0739d27cb90c4ecc41f8c773821e2e0b","sha256:16b571f0c143c6d27137e2952c5ff9bac6b3ff21c6648202a8eccbbc2260fde9"],"state_sha256":"b119863c35a0ea7cbbf863cdde7d63951854f138d9f152230ea4d74bb94a58da"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IogHn6jerqDoN+uQmRsnns0IicllG9Ac8E6fXtRppZK6TzPsoPxxfi/uBIvA4Wu97j+jaBN3r2/BrmqUZjtdBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-18T08:31:34.248379Z","bundle_sha256":"1b0323ce1512f77faf8ccf02bb531753d135f12f35a96aa6fee58e1abf08e7f2"}}