{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:YEXXASALC5BYKQEMWZHAUMX7MM","short_pith_number":"pith:YEXXASAL","canonical_record":{"source":{"id":"2504.20247","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2025-04-28T20:36:50Z","cross_cats_sorted":[],"title_canon_sha256":"eafa11785a67049531e4f32f64f41f43627c50b1e682da7762714e1fe1ebc5f4","abstract_canon_sha256":"4f4a6b668092728beb7e72859417422fa6604f098d3281f0cee296e875c79cb3"},"schema_version":"1.0"},"canonical_sha256":"c12f70480b174385408cb64e0a32ff6313298ef47c79d91a1ea7bf3dcc8ea5b4","source":{"kind":"arxiv","id":"2504.20247","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.20247","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"arxiv_version","alias_value":"2504.20247v1","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.20247","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"pith_short_12","alias_value":"YEXXASALC5BY","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"pith_short_16","alias_value":"YEXXASALC5BYKQEM","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"pith_short_8","alias_value":"YEXXASAL","created_at":"2026-07-05T11:23:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:YEXXASALC5BYKQEMWZHAUMX7MM","target":"record","payload":{"canonical_record":{"source":{"id":"2504.20247","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2025-04-28T20:36:50Z","cross_cats_sorted":[],"title_canon_sha256":"eafa11785a67049531e4f32f64f41f43627c50b1e682da7762714e1fe1ebc5f4","abstract_canon_sha256":"4f4a6b668092728beb7e72859417422fa6604f098d3281f0cee296e875c79cb3"},"schema_version":"1.0"},"canonical_sha256":"c12f70480b174385408cb64e0a32ff6313298ef47c79d91a1ea7bf3dcc8ea5b4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:23:27.794768Z","signature_b64":"BBhPKKvYS+viB45Pzo/tmsRCFa0jOAR3Qk5182A3gx4oTTByDPCSTqEu+i8p7by4bdH17dulMPesgS2Rdlz7CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c12f70480b174385408cb64e0a32ff6313298ef47c79d91a1ea7bf3dcc8ea5b4","last_reissued_at":"2026-07-05T11:23:27.794306Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:23:27.794306Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.20247","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":"2026-07-05T11:23:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ks0FG85tEelYjm/2TKdgJPi8PuHaMZPIGdWyMf3xnSFElAylLgQTJfXCMIrlUCoVLm6qqcc9tFqnfazl+1jXBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T22:59:06.769724Z"},"content_sha256":"54219443654d70ba1a214090f156db48d78371415ff55221dd10fbbae8b2ca99","schema_version":"1.0","event_id":"sha256:54219443654d70ba1a214090f156db48d78371415ff55221dd10fbbae8b2ca99"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:YEXXASALC5BYKQEMWZHAUMX7MM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Density Functional Tight-Binding Enables Tractable Studies of Quantum Plasmonics","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Abhisek Ghosal, George C. Schatz, Nikhil S. Chellam, Sajal K. Giri, Subhajyoti Chaudhuri","submitted_at":"2025-04-28T20:36:50Z","abstract_excerpt":"Routine investigations of plasmonic phenomena at the quantum level present a formidable computational challenge due to the large system sizes and ultrafast timescales involved. This Feature Article highlights the use of density functional tight-binding (DFTB), particularly its real-time time-dependent formulation (RT-TDDFTB), as a tractable approach to study plasmonic nanostructures from a purely quantum mechanical purview. We begin by outlining the theoretical framework and limitations of DFTB, emphasizing its efficiency in modeling systems with thousands of atoms over picosecond timescales. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.20247","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/2504.20247/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":"2026-07-05T11:23:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/EFY5klcWoQtq+mkyZtLS0gJSamkCqnXJaaLPqigmuszQURu3OONbn5607pXXmCaouwayrL6cD0RPx2AyT7zAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T22:59:06.770336Z"},"content_sha256":"744569cc67af5df465dfb8c997b6ab4e6b6dc846ea6e9492fa361bc60e85d7c0","schema_version":"1.0","event_id":"sha256:744569cc67af5df465dfb8c997b6ab4e6b6dc846ea6e9492fa361bc60e85d7c0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YEXXASALC5BYKQEMWZHAUMX7MM/bundle.json","state_url":"https://pith.science/pith/YEXXASALC5BYKQEMWZHAUMX7MM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YEXXASALC5BYKQEMWZHAUMX7MM/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":"2026-08-20T22:59:06Z","links":{"resolver":"https://pith.science/pith/YEXXASALC5BYKQEMWZHAUMX7MM","bundle":"https://pith.science/pith/YEXXASALC5BYKQEMWZHAUMX7MM/bundle.json","state":"https://pith.science/pith/YEXXASALC5BYKQEMWZHAUMX7MM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YEXXASALC5BYKQEMWZHAUMX7MM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:YEXXASALC5BYKQEMWZHAUMX7MM","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":"4f4a6b668092728beb7e72859417422fa6604f098d3281f0cee296e875c79cb3","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2025-04-28T20:36:50Z","title_canon_sha256":"eafa11785a67049531e4f32f64f41f43627c50b1e682da7762714e1fe1ebc5f4"},"schema_version":"1.0","source":{"id":"2504.20247","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.20247","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"arxiv_version","alias_value":"2504.20247v1","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.20247","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"pith_short_12","alias_value":"YEXXASALC5BY","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"pith_short_16","alias_value":"YEXXASALC5BYKQEM","created_at":"2026-07-05T11:23:27Z"},{"alias_kind":"pith_short_8","alias_value":"YEXXASAL","created_at":"2026-07-05T11:23:27Z"}],"graph_snapshots":[{"event_id":"sha256:744569cc67af5df465dfb8c997b6ab4e6b6dc846ea6e9492fa361bc60e85d7c0","target":"graph","created_at":"2026-07-05T11:23:27Z","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/2504.20247/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Routine investigations of plasmonic phenomena at the quantum level present a formidable computational challenge due to the large system sizes and ultrafast timescales involved. This Feature Article highlights the use of density functional tight-binding (DFTB), particularly its real-time time-dependent formulation (RT-TDDFTB), as a tractable approach to study plasmonic nanostructures from a purely quantum mechanical purview. We begin by outlining the theoretical framework and limitations of DFTB, emphasizing its efficiency in modeling systems with thousands of atoms over picosecond timescales. ","authors_text":"Abhisek Ghosal, George C. Schatz, Nikhil S. Chellam, Sajal K. Giri, Subhajyoti Chaudhuri","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2025-04-28T20:36:50Z","title":"Density Functional Tight-Binding Enables Tractable Studies of Quantum Plasmonics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.20247","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":"sha256:54219443654d70ba1a214090f156db48d78371415ff55221dd10fbbae8b2ca99","target":"record","created_at":"2026-07-05T11:23:27Z","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":"4f4a6b668092728beb7e72859417422fa6604f098d3281f0cee296e875c79cb3","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2025-04-28T20:36:50Z","title_canon_sha256":"eafa11785a67049531e4f32f64f41f43627c50b1e682da7762714e1fe1ebc5f4"},"schema_version":"1.0","source":{"id":"2504.20247","kind":"arxiv","version":1}},"canonical_sha256":"c12f70480b174385408cb64e0a32ff6313298ef47c79d91a1ea7bf3dcc8ea5b4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c12f70480b174385408cb64e0a32ff6313298ef47c79d91a1ea7bf3dcc8ea5b4","first_computed_at":"2026-07-05T11:23:27.794306Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:23:27.794306Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BBhPKKvYS+viB45Pzo/tmsRCFa0jOAR3Qk5182A3gx4oTTByDPCSTqEu+i8p7by4bdH17dulMPesgS2Rdlz7CA==","signature_status":"signed_v1","signed_at":"2026-07-05T11:23:27.794768Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.20247","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:54219443654d70ba1a214090f156db48d78371415ff55221dd10fbbae8b2ca99","sha256:744569cc67af5df465dfb8c997b6ab4e6b6dc846ea6e9492fa361bc60e85d7c0"],"state_sha256":"d8d8624c56f4b95a0a326182e71b1e24f30cd09277a2ad8c51522a2ed243de08"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2/WijQPc7Bt5oBWLFDYWa2H6EDgBaFwkAejwzTKzyxv8BrVSpH34qUQvaRBmrkTwspCQjE+OKdyDleP4lgP2Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T22:59:06.774993Z","bundle_sha256":"c4f582083b4dc4a4c159cd33f7c9beec647156c13d0167ce8126117f722c1846"}}