{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:GP3ERDQ4HBEKSN7NJHSVGY3YFP","short_pith_number":"pith:GP3ERDQ4","schema_version":"1.0","canonical_sha256":"33f6488e1c3848a937ed49e55363782bd0a23bd65c122eb25d8970d63fb658ac","source":{"kind":"arxiv","id":"0904.0297","version":1},"attestation_state":"computed","paper":{"title":"Quasiperiodic free electron metal layers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. K. Shukla, D. Wu, J. Hafner, K. Horn, M. Krajci, R. S. Dhaka, Sanjay Singh, S. R. Barman, S. W. Dsouza, T. A. Lograsso","submitted_at":"2009-04-02T03:11:00Z","abstract_excerpt":"Using electron diffraction, we show that free electron metals such as sodium and potassium form a highly regular quasiperiodic monolayer on the fivefold surface of icosahedral Al-Pd-Mn and that the quasiperiodicity propagates up to the second layer in sodium. Our photoelectron spectroscopy results show that the quasicrystalline alkali metal adlayer does not exhibit a pseudogap near the Fermi level, thought to be charactersitic for the electronic structure of quasicrystalline materials. Calculations based on density functional theory provide a model structure for the quasicrystalline alkali met"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"0904.0297","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-04-02T03:11:00Z","cross_cats_sorted":[],"title_canon_sha256":"81a42956f07e20491be8b23609fa008616039dbf1d9f5a2acc32f39e8f77c714","abstract_canon_sha256":"5f222a9c8ccb1f4630ad0a27fa2696d7dde6edf2b05cbf7b79e796159c199365"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:53:12.824382Z","signature_b64":"axQGT6BcKUSMs0rpyRXgHsrLxgv+D/4AaJcgF7fTdHJGZBKQiv7OHqin9XPMQEvyobaQOetgdnlKONmbot/JDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"33f6488e1c3848a937ed49e55363782bd0a23bd65c122eb25d8970d63fb658ac","last_reissued_at":"2026-07-04T15:53:12.823892Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:53:12.823892Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Quasiperiodic free electron metal layers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. K. Shukla, D. Wu, J. Hafner, K. Horn, M. Krajci, R. S. Dhaka, Sanjay Singh, S. R. Barman, S. W. Dsouza, T. A. Lograsso","submitted_at":"2009-04-02T03:11:00Z","abstract_excerpt":"Using electron diffraction, we show that free electron metals such as sodium and potassium form a highly regular quasiperiodic monolayer on the fivefold surface of icosahedral Al-Pd-Mn and that the quasiperiodicity propagates up to the second layer in sodium. Our photoelectron spectroscopy results show that the quasicrystalline alkali metal adlayer does not exhibit a pseudogap near the Fermi level, thought to be charactersitic for the electronic structure of quasicrystalline materials. Calculations based on density functional theory provide a model structure for the quasicrystalline alkali met"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.0297","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/0904.0297/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"0904.0297","created_at":"2026-07-04T15:53:12.823950+00:00"},{"alias_kind":"arxiv_version","alias_value":"0904.0297v1","created_at":"2026-07-04T15:53:12.823950+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.0297","created_at":"2026-07-04T15:53:12.823950+00:00"},{"alias_kind":"pith_short_12","alias_value":"GP3ERDQ4HBEK","created_at":"2026-07-04T15:53:12.823950+00:00"},{"alias_kind":"pith_short_16","alias_value":"GP3ERDQ4HBEKSN7N","created_at":"2026-07-04T15:53:12.823950+00:00"},{"alias_kind":"pith_short_8","alias_value":"GP3ERDQ4","created_at":"2026-07-04T15:53:12.823950+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/GP3ERDQ4HBEKSN7NJHSVGY3YFP","json":"https://pith.science/pith/GP3ERDQ4HBEKSN7NJHSVGY3YFP.json","graph_json":"https://pith.science/api/pith-number/GP3ERDQ4HBEKSN7NJHSVGY3YFP/graph.json","events_json":"https://pith.science/api/pith-number/GP3ERDQ4HBEKSN7NJHSVGY3YFP/events.json","paper":"https://pith.science/paper/GP3ERDQ4"},"agent_actions":{"view_html":"https://pith.science/pith/GP3ERDQ4HBEKSN7NJHSVGY3YFP","download_json":"https://pith.science/pith/GP3ERDQ4HBEKSN7NJHSVGY3YFP.json","view_paper":"https://pith.science/paper/GP3ERDQ4","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0904.0297&json=true","fetch_graph":"https://pith.science/api/pith-number/GP3ERDQ4HBEKSN7NJHSVGY3YFP/graph.json","fetch_events":"https://pith.science/api/pith-number/GP3ERDQ4HBEKSN7NJHSVGY3YFP/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/GP3ERDQ4HBEKSN7NJHSVGY3YFP/action/timestamp_anchor","attest_storage":"https://pith.science/pith/GP3ERDQ4HBEKSN7NJHSVGY3YFP/action/storage_attestation","attest_author":"https://pith.science/pith/GP3ERDQ4HBEKSN7NJHSVGY3YFP/action/author_attestation","sign_citation":"https://pith.science/pith/GP3ERDQ4HBEKSN7NJHSVGY3YFP/action/citation_signature","submit_replication":"https://pith.science/pith/GP3ERDQ4HBEKSN7NJHSVGY3YFP/action/replication_record"}},"created_at":"2026-07-04T15:53:12.823950+00:00","updated_at":"2026-07-04T15:53:12.823950+00:00"}