{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:W7N5CW4ATKALJDYQRBW2AM5GCH","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":"4004ba47368d6b5dd1cfba991e60141aa940028c27fbd9947657d0fb1244c7ea","cross_cats_sorted":["cond-mat.supr-con","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-10-08T11:25:51Z","title_canon_sha256":"6057b1efa6a84cbc1b3a3655807156c9e83bd85a7231ac4431773adc01cc3383"},"schema_version":"1.0","source":{"id":"1810.03376","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.03376","created_at":"2026-05-17T23:55:11Z"},{"alias_kind":"arxiv_version","alias_value":"1810.03376v2","created_at":"2026-05-17T23:55:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.03376","created_at":"2026-05-17T23:55:11Z"},{"alias_kind":"pith_short_12","alias_value":"W7N5CW4ATKAL","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"W7N5CW4ATKALJDYQ","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"W7N5CW4A","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:df840296ba64b001dcdf9ce16ca3b52843ac64fc7d042aac86dc574723477368","target":"graph","created_at":"2026-05-17T23:55:11Z","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 study a topological band degeneracy in non-Hermitian systems with parity-time ($PT$) and parity-particle-hole ($CP$) symmetries. In $d$-dimensional non-Hermitian systems, it is shown that $(d-1)$-dimensional exceptional surfaces can appear from band touching thanks to $PT$ or $CP$ symmetry. We investigate the topological stability and zero-gap quasiparticles for the exceptional surfaces due to the band degeneracy. We also demonstrate the band degeneracy by using lattice models of a topological semimetal and a superconductor.","authors_text":"Ryo Okugawa, Takehito Yokoyama","cross_cats":["cond-mat.supr-con","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-10-08T11:25:51Z","title":"Topological exceptional surfaces in non-Hermitian systems with parity-time and parity-particle-hole symmetries"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.03376","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":"sha256:24261a71652d0cbd456742f316f4f9613fd540afab6907749f3ac449bf6fa29b","target":"record","created_at":"2026-05-17T23:55:11Z","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":"4004ba47368d6b5dd1cfba991e60141aa940028c27fbd9947657d0fb1244c7ea","cross_cats_sorted":["cond-mat.supr-con","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2018-10-08T11:25:51Z","title_canon_sha256":"6057b1efa6a84cbc1b3a3655807156c9e83bd85a7231ac4431773adc01cc3383"},"schema_version":"1.0","source":{"id":"1810.03376","kind":"arxiv","version":2}},"canonical_sha256":"b7dbd15b809a80b48f10886da033a611c7b5950ae479668b65ffb78563e8aedd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b7dbd15b809a80b48f10886da033a611c7b5950ae479668b65ffb78563e8aedd","first_computed_at":"2026-05-17T23:55:11.511289Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:11.511289Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8q6jg8P0gkc4xn6G3jScM9R98ZmpSZexVefKWbRXBzER4LB1dwGEe7an2jPZXXgrQn0gTC6MAyrbppgCTyzhAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:11.511740Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.03376","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:24261a71652d0cbd456742f316f4f9613fd540afab6907749f3ac449bf6fa29b","sha256:df840296ba64b001dcdf9ce16ca3b52843ac64fc7d042aac86dc574723477368"],"state_sha256":"6a4cf4b597de2e25acaf3489a4be456837f90bbf8421772c1ef56bbd0bdc4174"}