{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:4Y55QRUW55LKPM6GPRLCMDOBUC","short_pith_number":"pith:4Y55QRUW","schema_version":"1.0","canonical_sha256":"e63bd84696ef56a7b3c67c56260dc1a08ad7c5d890b245a6cad0912b826e328a","source":{"kind":"arxiv","id":"1106.2802","version":1},"attestation_state":"computed","paper":{"title":"Stable Nanotubular Crystal of Silicon: A Predicted Allotrope With Direct Band Gap","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chi-Pui Tang, Jie Cao, Shi-jie Xiong","submitted_at":"2011-06-14T09:33:23Z","abstract_excerpt":"On basis of the first principle calculation we show that a crystalline structure of silicon, as a novel allotrope with nanotubular holes along two perpendicular directions, is stable. The calculations on geometrical and electronic properties reveal that this allotrope possesses a direct band gap wider by 0.5eV than the indirect one of silicon with diamond structure. The crystal belongs to I41/AMD space group, showing anisotropic optical properties and Young modulus. The bulk modulus is 64.4GPa and the density is 1.9g/cm$^{3}$, lower than that of the diamond silicon due to the presence of nanot"},"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":"1106.2802","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-06-14T09:33:23Z","cross_cats_sorted":[],"title_canon_sha256":"a38461c749dc7a8c0d5e351fbb3133c9b04bd3163a20df3c58a683390044c9bb","abstract_canon_sha256":"2ecdcacc0c0c6affe641d5f6746f1c1af8201ae787f331182ba7df83e65be321"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:19:55.558161Z","signature_b64":"4g9s6z+ocVJRqtGMq93Bzxj3wNVu/Tno7bCyEVtFHLfZ8d7MGX3xcxEMlcznd+Elc0c0OGYjiQ/V0Kl8tmzQCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e63bd84696ef56a7b3c67c56260dc1a08ad7c5d890b245a6cad0912b826e328a","last_reissued_at":"2026-05-18T04:19:55.557494Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:19:55.557494Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Stable Nanotubular Crystal of Silicon: A Predicted Allotrope With Direct Band Gap","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chi-Pui Tang, Jie Cao, Shi-jie Xiong","submitted_at":"2011-06-14T09:33:23Z","abstract_excerpt":"On basis of the first principle calculation we show that a crystalline structure of silicon, as a novel allotrope with nanotubular holes along two perpendicular directions, is stable. The calculations on geometrical and electronic properties reveal that this allotrope possesses a direct band gap wider by 0.5eV than the indirect one of silicon with diamond structure. The crystal belongs to I41/AMD space group, showing anisotropic optical properties and Young modulus. The bulk modulus is 64.4GPa and the density is 1.9g/cm$^{3}$, lower than that of the diamond silicon due to the presence of nanot"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1106.2802","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1106.2802","created_at":"2026-05-18T04:19:55.557599+00:00"},{"alias_kind":"arxiv_version","alias_value":"1106.2802v1","created_at":"2026-05-18T04:19:55.557599+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1106.2802","created_at":"2026-05-18T04:19:55.557599+00:00"},{"alias_kind":"pith_short_12","alias_value":"4Y55QRUW55LK","created_at":"2026-05-18T12:26:20.644004+00:00"},{"alias_kind":"pith_short_16","alias_value":"4Y55QRUW55LKPM6G","created_at":"2026-05-18T12:26:20.644004+00:00"},{"alias_kind":"pith_short_8","alias_value":"4Y55QRUW","created_at":"2026-05-18T12:26:20.644004+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/4Y55QRUW55LKPM6GPRLCMDOBUC","json":"https://pith.science/pith/4Y55QRUW55LKPM6GPRLCMDOBUC.json","graph_json":"https://pith.science/api/pith-number/4Y55QRUW55LKPM6GPRLCMDOBUC/graph.json","events_json":"https://pith.science/api/pith-number/4Y55QRUW55LKPM6GPRLCMDOBUC/events.json","paper":"https://pith.science/paper/4Y55QRUW"},"agent_actions":{"view_html":"https://pith.science/pith/4Y55QRUW55LKPM6GPRLCMDOBUC","download_json":"https://pith.science/pith/4Y55QRUW55LKPM6GPRLCMDOBUC.json","view_paper":"https://pith.science/paper/4Y55QRUW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1106.2802&json=true","fetch_graph":"https://pith.science/api/pith-number/4Y55QRUW55LKPM6GPRLCMDOBUC/graph.json","fetch_events":"https://pith.science/api/pith-number/4Y55QRUW55LKPM6GPRLCMDOBUC/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4Y55QRUW55LKPM6GPRLCMDOBUC/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4Y55QRUW55LKPM6GPRLCMDOBUC/action/storage_attestation","attest_author":"https://pith.science/pith/4Y55QRUW55LKPM6GPRLCMDOBUC/action/author_attestation","sign_citation":"https://pith.science/pith/4Y55QRUW55LKPM6GPRLCMDOBUC/action/citation_signature","submit_replication":"https://pith.science/pith/4Y55QRUW55LKPM6GPRLCMDOBUC/action/replication_record"}},"created_at":"2026-05-18T04:19:55.557599+00:00","updated_at":"2026-05-18T04:19:55.557599+00:00"}