{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:7H6ITHVFX4TGVS6M3MZB7325ZI","short_pith_number":"pith:7H6ITHVF","canonical_record":{"source":{"id":"1902.07972","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-02-21T11:28:29Z","cross_cats_sorted":["cond-mat.quant-gas","math-ph","math.MP","physics.optics","quant-ph"],"title_canon_sha256":"1b575df01ad08f975e308c9a6945c92fe74f5852f48336339d21b6a8f8734652","abstract_canon_sha256":"995b4d674cb43d6ed4b7e83d5b5f3b6e7de38e8f5dde00be6c11f1f75a311ad3"},"schema_version":"1.0"},"canonical_sha256":"f9fc899ea5bf266acbccdb321fef5dca28681e7771680b112bc51a14c40f894b","source":{"kind":"arxiv","id":"1902.07972","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.07972","created_at":"2026-05-17T23:40:23Z"},{"alias_kind":"arxiv_version","alias_value":"1902.07972v4","created_at":"2026-05-17T23:40:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.07972","created_at":"2026-05-17T23:40:23Z"},{"alias_kind":"pith_short_12","alias_value":"7H6ITHVFX4TG","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_16","alias_value":"7H6ITHVFX4TGVS6M","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_8","alias_value":"7H6ITHVF","created_at":"2026-05-18T12:33:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:7H6ITHVFX4TGVS6M3MZB7325ZI","target":"record","payload":{"canonical_record":{"source":{"id":"1902.07972","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-02-21T11:28:29Z","cross_cats_sorted":["cond-mat.quant-gas","math-ph","math.MP","physics.optics","quant-ph"],"title_canon_sha256":"1b575df01ad08f975e308c9a6945c92fe74f5852f48336339d21b6a8f8734652","abstract_canon_sha256":"995b4d674cb43d6ed4b7e83d5b5f3b6e7de38e8f5dde00be6c11f1f75a311ad3"},"schema_version":"1.0"},"canonical_sha256":"f9fc899ea5bf266acbccdb321fef5dca28681e7771680b112bc51a14c40f894b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:40:23.630598Z","signature_b64":"zc2TjB/2FnZzI93inUpJ7YmF3GGFT1m4TDu5NhAnve/kIsRwEDtOj0jIw6vFAJoV6yOuXqeJ8YE+Uu/7bsVbCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f9fc899ea5bf266acbccdb321fef5dca28681e7771680b112bc51a14c40f894b","last_reissued_at":"2026-05-17T23:40:23.629916Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:40:23.629916Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1902.07972","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:40:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b0bpiVgLxOFmUnoci1iFtztHTm7iTJ3PEc+F6PYES6DvlRSGUmTKuIj35+r7JtZ74lri42cJgCCRHnAMLLvBAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T03:58:32.620679Z"},"content_sha256":"76882348a99ad0eec93a0c9c8d7f43fa148681270889093e828049a00a87047b","schema_version":"1.0","event_id":"sha256:76882348a99ad0eec93a0c9c8d7f43fa148681270889093e828049a00a87047b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:7H6ITHVFX4TGVS6M3MZB7325ZI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"New topological invariants in non-Hermitian systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.quant-gas","math-ph","math.MP","physics.optics","quant-ph"],"primary_cat":"cond-mat.mes-hall","authors_text":"Ananya Ghatak, Tanmoy Das","submitted_at":"2019-02-21T11:28:29Z","abstract_excerpt":"Both theoretical and experimental studies of topological phases in non-Hermitian systems have made a remarkable progress in the last few years of research. In this article, we review the key concepts pertaining to topological phases in non-Hermitian Hamiltonians with relevant examples and realistic model setups. Discussions are devoted to both the adaptations of topological invariants from Hermitian to non-Hermitian systems, as well as origins of new topological invariants in the latter setup. Unique properties such as exceptional points and complex energy landscapes lead to new topological in"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.07972","kind":"arxiv","version":4},"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":"2026-05-17T23:40:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dezpsVGORqsIF3O7mk7PUqouP5N41H94JV7WQ1giivjM+Jv8EljMhdnkML2oMZurCpM9eECfVXZoauh29Wq2AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T03:58:32.621151Z"},"content_sha256":"e2aa80045d6b2b9db58616a025f2d469388acf1f5521cfb14bacbfaa02a36ab3","schema_version":"1.0","event_id":"sha256:e2aa80045d6b2b9db58616a025f2d469388acf1f5521cfb14bacbfaa02a36ab3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7H6ITHVFX4TGVS6M3MZB7325ZI/bundle.json","state_url":"https://pith.science/pith/7H6ITHVFX4TGVS6M3MZB7325ZI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7H6ITHVFX4TGVS6M3MZB7325ZI/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":"2026-08-09T03:58:32Z","links":{"resolver":"https://pith.science/pith/7H6ITHVFX4TGVS6M3MZB7325ZI","bundle":"https://pith.science/pith/7H6ITHVFX4TGVS6M3MZB7325ZI/bundle.json","state":"https://pith.science/pith/7H6ITHVFX4TGVS6M3MZB7325ZI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7H6ITHVFX4TGVS6M3MZB7325ZI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:7H6ITHVFX4TGVS6M3MZB7325ZI","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":"995b4d674cb43d6ed4b7e83d5b5f3b6e7de38e8f5dde00be6c11f1f75a311ad3","cross_cats_sorted":["cond-mat.quant-gas","math-ph","math.MP","physics.optics","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-02-21T11:28:29Z","title_canon_sha256":"1b575df01ad08f975e308c9a6945c92fe74f5852f48336339d21b6a8f8734652"},"schema_version":"1.0","source":{"id":"1902.07972","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.07972","created_at":"2026-05-17T23:40:23Z"},{"alias_kind":"arxiv_version","alias_value":"1902.07972v4","created_at":"2026-05-17T23:40:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.07972","created_at":"2026-05-17T23:40:23Z"},{"alias_kind":"pith_short_12","alias_value":"7H6ITHVFX4TG","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_16","alias_value":"7H6ITHVFX4TGVS6M","created_at":"2026-05-18T12:33:12Z"},{"alias_kind":"pith_short_8","alias_value":"7H6ITHVF","created_at":"2026-05-18T12:33:12Z"}],"graph_snapshots":[{"event_id":"sha256:e2aa80045d6b2b9db58616a025f2d469388acf1f5521cfb14bacbfaa02a36ab3","target":"graph","created_at":"2026-05-17T23:40:23Z","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":"Both theoretical and experimental studies of topological phases in non-Hermitian systems have made a remarkable progress in the last few years of research. In this article, we review the key concepts pertaining to topological phases in non-Hermitian Hamiltonians with relevant examples and realistic model setups. Discussions are devoted to both the adaptations of topological invariants from Hermitian to non-Hermitian systems, as well as origins of new topological invariants in the latter setup. Unique properties such as exceptional points and complex energy landscapes lead to new topological in","authors_text":"Ananya Ghatak, Tanmoy Das","cross_cats":["cond-mat.quant-gas","math-ph","math.MP","physics.optics","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-02-21T11:28:29Z","title":"New topological invariants in non-Hermitian systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.07972","kind":"arxiv","version":4},"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":"sha256:76882348a99ad0eec93a0c9c8d7f43fa148681270889093e828049a00a87047b","target":"record","created_at":"2026-05-17T23:40:23Z","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":"995b4d674cb43d6ed4b7e83d5b5f3b6e7de38e8f5dde00be6c11f1f75a311ad3","cross_cats_sorted":["cond-mat.quant-gas","math-ph","math.MP","physics.optics","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-02-21T11:28:29Z","title_canon_sha256":"1b575df01ad08f975e308c9a6945c92fe74f5852f48336339d21b6a8f8734652"},"schema_version":"1.0","source":{"id":"1902.07972","kind":"arxiv","version":4}},"canonical_sha256":"f9fc899ea5bf266acbccdb321fef5dca28681e7771680b112bc51a14c40f894b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f9fc899ea5bf266acbccdb321fef5dca28681e7771680b112bc51a14c40f894b","first_computed_at":"2026-05-17T23:40:23.629916Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:40:23.629916Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zc2TjB/2FnZzI93inUpJ7YmF3GGFT1m4TDu5NhAnve/kIsRwEDtOj0jIw6vFAJoV6yOuXqeJ8YE+Uu/7bsVbCw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:40:23.630598Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.07972","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:76882348a99ad0eec93a0c9c8d7f43fa148681270889093e828049a00a87047b","sha256:e2aa80045d6b2b9db58616a025f2d469388acf1f5521cfb14bacbfaa02a36ab3"],"state_sha256":"534f3a6db28c7fe539613155e958137ae0604fa41de325f60efc83df18cafcaf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z/9dQyEkGCtv3skrtaTTyEvDuRMBAXx3GcuEOmQFfx1qaZ553Vn78NR1RcbMweiQ7LCSoUXhoUTMZ0AczHh/Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T03:58:32.627186Z","bundle_sha256":"9733e09261821e4c8500a943ca4fcf7c8e2ea7493714e20d4ba34369e16780be"}}