{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:YJDO2X3KE6FSFJ24UYQ3BPVECB","short_pith_number":"pith:YJDO2X3K","canonical_record":{"source":{"id":"1601.02657","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-11T21:27:58Z","cross_cats_sorted":[],"title_canon_sha256":"d68a519e06e43947e0d487edaa00e6c79b34c81cbc8b435c51f0b23cf95d25a9","abstract_canon_sha256":"00011ad927c57a380c8a5b1c28718e1f2e65a63352030a26e836ea59299dced4"},"schema_version":"1.0"},"canonical_sha256":"c246ed5f6a278b22a75ca621b0bea4105e13827b9e04e92ffca9c9fb911019f4","source":{"kind":"arxiv","id":"1601.02657","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.02657","created_at":"2026-05-18T01:16:43Z"},{"alias_kind":"arxiv_version","alias_value":"1601.02657v1","created_at":"2026-05-18T01:16:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.02657","created_at":"2026-05-18T01:16:43Z"},{"alias_kind":"pith_short_12","alias_value":"YJDO2X3KE6FS","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YJDO2X3KE6FSFJ24","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YJDO2X3K","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:YJDO2X3KE6FSFJ24UYQ3BPVECB","target":"record","payload":{"canonical_record":{"source":{"id":"1601.02657","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-11T21:27:58Z","cross_cats_sorted":[],"title_canon_sha256":"d68a519e06e43947e0d487edaa00e6c79b34c81cbc8b435c51f0b23cf95d25a9","abstract_canon_sha256":"00011ad927c57a380c8a5b1c28718e1f2e65a63352030a26e836ea59299dced4"},"schema_version":"1.0"},"canonical_sha256":"c246ed5f6a278b22a75ca621b0bea4105e13827b9e04e92ffca9c9fb911019f4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:16:43.569887Z","signature_b64":"UkjHR7lMaEGvjgMOZj8ks3aOJJtrwl63pT4Rl+Vp2uwqIn9m2mCXRMLTGSXLL1jktMGatKdRDL2Vu1thEFGxCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c246ed5f6a278b22a75ca621b0bea4105e13827b9e04e92ffca9c9fb911019f4","last_reissued_at":"2026-05-18T01:16:43.569239Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:16:43.569239Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.02657","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":"2026-05-18T01:16:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wy+LUlPaBAQlyUY7wWmJ6y5J/BFZibj3VZxUxboAvkytXXqBTeedejJkCT05WJ7qSsLmZzCMyGlFFm/APD4vAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T12:10:40.521829Z"},"content_sha256":"3611f8754ddc46e8535f56740bf6717c6abcb07a99760918548bb9c6cd65d7a4","schema_version":"1.0","event_id":"sha256:3611f8754ddc46e8535f56740bf6717c6abcb07a99760918548bb9c6cd65d7a4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:YJDO2X3KE6FSFJ24UYQ3BPVECB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Accurate Tight-Binding Hamiltonians for 2D and Layered Materials","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Andrea Ferretti, Davide Ceresoli, Luis Agapito, Marco Buongiorno Nardelli, Marco Fornari, Stefano Curtarolo","submitted_at":"2016-01-11T21:27:58Z","abstract_excerpt":"We present a scheme to controllably improve the accuracy of tight-binding Hamiltonian matrices derived by projecting the solutions of plane-wave ab initio calculations on atomic orbital basis sets. By systematically increasing the completeness of the basis set of atomic orbitals, we are able to optimize the quality of the band structure interpolation over wide energy ranges including unoccupied states. This methodology is applied to the case of interlayer and image states, which appear several eV above the Fermi level in materials with large interstitial regions or surfaces such as graphite an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.02657","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":""},"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":"2026-05-18T01:16:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4zp2Ct1Av8nFcpMKyHwWNKeP9JHWXBEbTdIDNlQC/An9Mw9NHVik/Blw212oSlXdx9U7F77ocQAnTNWe6xK1AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T12:10:40.522167Z"},"content_sha256":"7a42dee871ab92f1de450d558a5c1ff55421e35b098a6991ab0d1d796b1beecc","schema_version":"1.0","event_id":"sha256:7a42dee871ab92f1de450d558a5c1ff55421e35b098a6991ab0d1d796b1beecc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YJDO2X3KE6FSFJ24UYQ3BPVECB/bundle.json","state_url":"https://pith.science/pith/YJDO2X3KE6FSFJ24UYQ3BPVECB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YJDO2X3KE6FSFJ24UYQ3BPVECB/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":"2026-05-20T12:10:40Z","links":{"resolver":"https://pith.science/pith/YJDO2X3KE6FSFJ24UYQ3BPVECB","bundle":"https://pith.science/pith/YJDO2X3KE6FSFJ24UYQ3BPVECB/bundle.json","state":"https://pith.science/pith/YJDO2X3KE6FSFJ24UYQ3BPVECB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YJDO2X3KE6FSFJ24UYQ3BPVECB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:YJDO2X3KE6FSFJ24UYQ3BPVECB","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":"00011ad927c57a380c8a5b1c28718e1f2e65a63352030a26e836ea59299dced4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-11T21:27:58Z","title_canon_sha256":"d68a519e06e43947e0d487edaa00e6c79b34c81cbc8b435c51f0b23cf95d25a9"},"schema_version":"1.0","source":{"id":"1601.02657","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.02657","created_at":"2026-05-18T01:16:43Z"},{"alias_kind":"arxiv_version","alias_value":"1601.02657v1","created_at":"2026-05-18T01:16:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.02657","created_at":"2026-05-18T01:16:43Z"},{"alias_kind":"pith_short_12","alias_value":"YJDO2X3KE6FS","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YJDO2X3KE6FSFJ24","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YJDO2X3K","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:7a42dee871ab92f1de450d558a5c1ff55421e35b098a6991ab0d1d796b1beecc","target":"graph","created_at":"2026-05-18T01:16:43Z","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 present a scheme to controllably improve the accuracy of tight-binding Hamiltonian matrices derived by projecting the solutions of plane-wave ab initio calculations on atomic orbital basis sets. By systematically increasing the completeness of the basis set of atomic orbitals, we are able to optimize the quality of the band structure interpolation over wide energy ranges including unoccupied states. This methodology is applied to the case of interlayer and image states, which appear several eV above the Fermi level in materials with large interstitial regions or surfaces such as graphite an","authors_text":"Andrea Ferretti, Davide Ceresoli, Luis Agapito, Marco Buongiorno Nardelli, Marco Fornari, Stefano Curtarolo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-11T21:27:58Z","title":"Accurate Tight-Binding Hamiltonians for 2D and Layered Materials"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.02657","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":"sha256:3611f8754ddc46e8535f56740bf6717c6abcb07a99760918548bb9c6cd65d7a4","target":"record","created_at":"2026-05-18T01:16:43Z","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":"00011ad927c57a380c8a5b1c28718e1f2e65a63352030a26e836ea59299dced4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-11T21:27:58Z","title_canon_sha256":"d68a519e06e43947e0d487edaa00e6c79b34c81cbc8b435c51f0b23cf95d25a9"},"schema_version":"1.0","source":{"id":"1601.02657","kind":"arxiv","version":1}},"canonical_sha256":"c246ed5f6a278b22a75ca621b0bea4105e13827b9e04e92ffca9c9fb911019f4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c246ed5f6a278b22a75ca621b0bea4105e13827b9e04e92ffca9c9fb911019f4","first_computed_at":"2026-05-18T01:16:43.569239Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:43.569239Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UkjHR7lMaEGvjgMOZj8ks3aOJJtrwl63pT4Rl+Vp2uwqIn9m2mCXRMLTGSXLL1jktMGatKdRDL2Vu1thEFGxCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:43.569887Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.02657","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3611f8754ddc46e8535f56740bf6717c6abcb07a99760918548bb9c6cd65d7a4","sha256:7a42dee871ab92f1de450d558a5c1ff55421e35b098a6991ab0d1d796b1beecc"],"state_sha256":"1472cb37b261c7e5ae5a96346bd81a5667364cdd844ca1b4cb25aa6718242906"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zJ7lg86wE5bj8jzQqDtCarm7Nkp3XIWnWRAvXmKw15c1er5XLydepAKHceW/YbYdVHJeSV8QWP6Gy9LYhag7BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T12:10:40.524192Z","bundle_sha256":"423036f6103e3656353a2e225ef5509d9dffc1fc4f809a438aa53ae395fbbbdc"}}