{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:N4G2UXJLFIOVJ7MVZHFQGJVT4Y","short_pith_number":"pith:N4G2UXJL","canonical_record":{"source":{"id":"1808.05073","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-08-15T13:38:27Z","cross_cats_sorted":[],"title_canon_sha256":"3732032ee41f5a334658edcb44eba234f94b9a5da6b355c186ebc3bc193b534c","abstract_canon_sha256":"87313448f2d365e7a9e39249c7fc3de06014f0faa879da46146bdf4790894a99"},"schema_version":"1.0"},"canonical_sha256":"6f0daa5d2b2a1d54fd95c9cb0326b3e627af3d3420d26b43eb5bc518bdcf8e79","source":{"kind":"arxiv","id":"1808.05073","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.05073","created_at":"2026-05-17T23:50:12Z"},{"alias_kind":"arxiv_version","alias_value":"1808.05073v2","created_at":"2026-05-17T23:50:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.05073","created_at":"2026-05-17T23:50:12Z"},{"alias_kind":"pith_short_12","alias_value":"N4G2UXJLFIOV","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"N4G2UXJLFIOVJ7MV","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"N4G2UXJL","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:N4G2UXJLFIOVJ7MVZHFQGJVT4Y","target":"record","payload":{"canonical_record":{"source":{"id":"1808.05073","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-08-15T13:38:27Z","cross_cats_sorted":[],"title_canon_sha256":"3732032ee41f5a334658edcb44eba234f94b9a5da6b355c186ebc3bc193b534c","abstract_canon_sha256":"87313448f2d365e7a9e39249c7fc3de06014f0faa879da46146bdf4790894a99"},"schema_version":"1.0"},"canonical_sha256":"6f0daa5d2b2a1d54fd95c9cb0326b3e627af3d3420d26b43eb5bc518bdcf8e79","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:12.789080Z","signature_b64":"K9KLYb5geQ2Ge9pKpo9QV4MP8YAax3EesP5mEAYlEXnpNCT4oOJIDN2CCwfm26zxf0XnWSHISlD/jo1YmeziAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6f0daa5d2b2a1d54fd95c9cb0326b3e627af3d3420d26b43eb5bc518bdcf8e79","last_reissued_at":"2026-05-17T23:50:12.788688Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:12.788688Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.05073","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":"2026-05-17T23:50:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2Oq4KS8gtdd7LF76VYw+C61CHTwWaGUP9xxlpMJKq80bafinAksPzuDPsHO2J71eDMw4J4WicBMW9FgKc1h7Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T03:19:55.339091Z"},"content_sha256":"1a82957f71e73cda176d2e95b2915ca964a1fa9cee2ecddf122b47f8d9c1f48b","schema_version":"1.0","event_id":"sha256:1a82957f71e73cda176d2e95b2915ca964a1fa9cee2ecddf122b47f8d9c1f48b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:N4G2UXJLFIOVJ7MVZHFQGJVT4Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Electron-phonon coupling, superconductivity and nontrivial band topology in NbN polytypes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Guang-Yu Guo, K. Ramesh Babu","submitted_at":"2018-08-15T13:38:27Z","abstract_excerpt":"In this paper, we investigate the electronic band structure, lattice dynamics and electron-phonon interaction in $\\delta$-NbN, $\\varepsilon$-NbN and WC-NbN by performing systematic ab initio calculations based on DFT-GGA. The calculated electronic band structures show that all three polytypes are metallic with the Nb $d$-orbital dominated energy bands near the Fermi level ($E_F$). The calculated phonon dispersion relations of $\\delta$-NbN are in good agreement with neutron scattering experiments. The electron-phonon coupling ($\\lambda$) in $\\delta$-NbN ($\\lambda=0.98$) is much stronger than in"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.05073","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":"2026-05-17T23:50:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rcqtZD8CIHQi10PYELX4uOL1UVCUJvHNI/ae4I6pzkw5JLaAdUfLyh0NiusDOLJ1dBohV/u0YIK6lh54ey81Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T03:19:55.339697Z"},"content_sha256":"20ff059d7e41e690abd748f79c5ec0c5fd5a47eb5797798534b5585bc76421f8","schema_version":"1.0","event_id":"sha256:20ff059d7e41e690abd748f79c5ec0c5fd5a47eb5797798534b5585bc76421f8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/N4G2UXJLFIOVJ7MVZHFQGJVT4Y/bundle.json","state_url":"https://pith.science/pith/N4G2UXJLFIOVJ7MVZHFQGJVT4Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/N4G2UXJLFIOVJ7MVZHFQGJVT4Y/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":"2026-07-02T03:19:55Z","links":{"resolver":"https://pith.science/pith/N4G2UXJLFIOVJ7MVZHFQGJVT4Y","bundle":"https://pith.science/pith/N4G2UXJLFIOVJ7MVZHFQGJVT4Y/bundle.json","state":"https://pith.science/pith/N4G2UXJLFIOVJ7MVZHFQGJVT4Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/N4G2UXJLFIOVJ7MVZHFQGJVT4Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:N4G2UXJLFIOVJ7MVZHFQGJVT4Y","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":"87313448f2d365e7a9e39249c7fc3de06014f0faa879da46146bdf4790894a99","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-08-15T13:38:27Z","title_canon_sha256":"3732032ee41f5a334658edcb44eba234f94b9a5da6b355c186ebc3bc193b534c"},"schema_version":"1.0","source":{"id":"1808.05073","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.05073","created_at":"2026-05-17T23:50:12Z"},{"alias_kind":"arxiv_version","alias_value":"1808.05073v2","created_at":"2026-05-17T23:50:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.05073","created_at":"2026-05-17T23:50:12Z"},{"alias_kind":"pith_short_12","alias_value":"N4G2UXJLFIOV","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"N4G2UXJLFIOVJ7MV","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"N4G2UXJL","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:20ff059d7e41e690abd748f79c5ec0c5fd5a47eb5797798534b5585bc76421f8","target":"graph","created_at":"2026-05-17T23:50:12Z","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":"In this paper, we investigate the electronic band structure, lattice dynamics and electron-phonon interaction in $\\delta$-NbN, $\\varepsilon$-NbN and WC-NbN by performing systematic ab initio calculations based on DFT-GGA. The calculated electronic band structures show that all three polytypes are metallic with the Nb $d$-orbital dominated energy bands near the Fermi level ($E_F$). The calculated phonon dispersion relations of $\\delta$-NbN are in good agreement with neutron scattering experiments. The electron-phonon coupling ($\\lambda$) in $\\delta$-NbN ($\\lambda=0.98$) is much stronger than in","authors_text":"Guang-Yu Guo, K. Ramesh Babu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-08-15T13:38:27Z","title":"Electron-phonon coupling, superconductivity and nontrivial band topology in NbN polytypes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.05073","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":"sha256:1a82957f71e73cda176d2e95b2915ca964a1fa9cee2ecddf122b47f8d9c1f48b","target":"record","created_at":"2026-05-17T23:50:12Z","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":"87313448f2d365e7a9e39249c7fc3de06014f0faa879da46146bdf4790894a99","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-08-15T13:38:27Z","title_canon_sha256":"3732032ee41f5a334658edcb44eba234f94b9a5da6b355c186ebc3bc193b534c"},"schema_version":"1.0","source":{"id":"1808.05073","kind":"arxiv","version":2}},"canonical_sha256":"6f0daa5d2b2a1d54fd95c9cb0326b3e627af3d3420d26b43eb5bc518bdcf8e79","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6f0daa5d2b2a1d54fd95c9cb0326b3e627af3d3420d26b43eb5bc518bdcf8e79","first_computed_at":"2026-05-17T23:50:12.788688Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:50:12.788688Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K9KLYb5geQ2Ge9pKpo9QV4MP8YAax3EesP5mEAYlEXnpNCT4oOJIDN2CCwfm26zxf0XnWSHISlD/jo1YmeziAw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:50:12.789080Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.05073","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1a82957f71e73cda176d2e95b2915ca964a1fa9cee2ecddf122b47f8d9c1f48b","sha256:20ff059d7e41e690abd748f79c5ec0c5fd5a47eb5797798534b5585bc76421f8"],"state_sha256":"c8cab6121a105d228cda273f50d7706f8f306b98721e788bc6a65d8b9c88ca44"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8n8S3QlEjIyMw54ct6T+dSuzlPDQ5gJS4cU0GcnVdMebqdi3MC8mdg22Vq2Lx4XYw+6nwBr8ZgYoyVcvmRCNAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-02T03:19:55.342846Z","bundle_sha256":"00ec2d79987f7851ad8333b1721ae7777ba1417d9b3bdd47080724c73664317f"}}