{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:AMSZNHDVITZUR7Z32FQPKB2UZG","short_pith_number":"pith:AMSZNHDV","canonical_record":{"source":{"id":"2302.05434","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2023-02-10T18:51:15Z","cross_cats_sorted":[],"title_canon_sha256":"4581fdd422868ea7ea206c1b128e8d5cfb147418a01e997d04117aef78a07d56","abstract_canon_sha256":"52ed8445571e127c7e46d12b32e321cd09efe5aabf30fed43c00d75f49f5bd07"},"schema_version":"1.0"},"canonical_sha256":"0325969c7544f348ff3bd160f50754c9b5b09a7b3ffaa67e2c50231ef7d92948","source":{"kind":"arxiv","id":"2302.05434","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2302.05434","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"arxiv_version","alias_value":"2302.05434v1","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2302.05434","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"pith_short_12","alias_value":"AMSZNHDVITZU","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"pith_short_16","alias_value":"AMSZNHDVITZUR7Z3","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"pith_short_8","alias_value":"AMSZNHDV","created_at":"2026-07-05T06:12:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:AMSZNHDVITZUR7Z32FQPKB2UZG","target":"record","payload":{"canonical_record":{"source":{"id":"2302.05434","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2023-02-10T18:51:15Z","cross_cats_sorted":[],"title_canon_sha256":"4581fdd422868ea7ea206c1b128e8d5cfb147418a01e997d04117aef78a07d56","abstract_canon_sha256":"52ed8445571e127c7e46d12b32e321cd09efe5aabf30fed43c00d75f49f5bd07"},"schema_version":"1.0"},"canonical_sha256":"0325969c7544f348ff3bd160f50754c9b5b09a7b3ffaa67e2c50231ef7d92948","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:12:44.407787Z","signature_b64":"tliRU4vKpVkkKivv23siE2+PhnznFXii27VRmL1zCc9W3dpNmDwqxg9gWS3GVYbtSkICX89xUiITQoUcDKjKDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0325969c7544f348ff3bd160f50754c9b5b09a7b3ffaa67e2c50231ef7d92948","last_reissued_at":"2026-07-05T06:12:44.407321Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:12:44.407321Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2302.05434","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":"2026-07-05T06:12:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M+vXLjDv41j6SbVb3EFT0xlIirNrjueeUo8dDot7xHVhrYfkHi83E/7YfN5zkRkY9Pbt8huzF1ww3h7x2pmYBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T09:35:56.196560Z"},"content_sha256":"2be6661bb03bdc2ccc895716c79d8b4b74b3eb447ef9b2f476dd531634a013ad","schema_version":"1.0","event_id":"sha256:2be6661bb03bdc2ccc895716c79d8b4b74b3eb447ef9b2f476dd531634a013ad"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:AMSZNHDVITZUR7Z32FQPKB2UZG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On-chip time-domain terahertz spectroscopy of superconducting films below the diffraction limit","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Abhay Nayak, Alex Potts, Andrea F. Young, Biljana Stamenic, Demis D. John, Kelson Kaj, Michael Nagel, Richard D. Averitt","submitted_at":"2023-02-10T18:51:15Z","abstract_excerpt":"Free-space time domain THz spectroscopy accesses electrodynamic responses in a frequency regime ideally matched to interacting condensed matter systems. However, THz spectroscopy is challenging when samples are physically smaller than the diffraction limit of ~0.5 mm, as is typical, for example, in van der Waals materials and heterostructures. Here, we present an on-chip, time-domain THz spectrometer based on semiconducting photoconductive switches with a bandwidth of 200 GHz to 750 GHz. We measure the optical conductivity of a 7.5-$\\mu$m wide NbN film across the superconducting transition, de"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2302.05434","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/2302.05434/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":"2026-07-05T06:12:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gTHzyUjlGd0T+K+HSCjWeoOIJbAPLwIh1BH4ddTnP2CVIISEeAnkaNOyHFe16yupdHEz9vUHO+mNaAYRmZVjBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T09:35:56.197570Z"},"content_sha256":"3f059f9ff2fc9abf04ff57f97cdb8de7998252b777b076b9cac93e17050f9e5d","schema_version":"1.0","event_id":"sha256:3f059f9ff2fc9abf04ff57f97cdb8de7998252b777b076b9cac93e17050f9e5d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AMSZNHDVITZUR7Z32FQPKB2UZG/bundle.json","state_url":"https://pith.science/pith/AMSZNHDVITZUR7Z32FQPKB2UZG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AMSZNHDVITZUR7Z32FQPKB2UZG/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":"2026-08-08T09:35:56Z","links":{"resolver":"https://pith.science/pith/AMSZNHDVITZUR7Z32FQPKB2UZG","bundle":"https://pith.science/pith/AMSZNHDVITZUR7Z32FQPKB2UZG/bundle.json","state":"https://pith.science/pith/AMSZNHDVITZUR7Z32FQPKB2UZG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AMSZNHDVITZUR7Z32FQPKB2UZG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:AMSZNHDVITZUR7Z32FQPKB2UZG","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":"52ed8445571e127c7e46d12b32e321cd09efe5aabf30fed43c00d75f49f5bd07","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2023-02-10T18:51:15Z","title_canon_sha256":"4581fdd422868ea7ea206c1b128e8d5cfb147418a01e997d04117aef78a07d56"},"schema_version":"1.0","source":{"id":"2302.05434","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2302.05434","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"arxiv_version","alias_value":"2302.05434v1","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2302.05434","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"pith_short_12","alias_value":"AMSZNHDVITZU","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"pith_short_16","alias_value":"AMSZNHDVITZUR7Z3","created_at":"2026-07-05T06:12:44Z"},{"alias_kind":"pith_short_8","alias_value":"AMSZNHDV","created_at":"2026-07-05T06:12:44Z"}],"graph_snapshots":[{"event_id":"sha256:3f059f9ff2fc9abf04ff57f97cdb8de7998252b777b076b9cac93e17050f9e5d","target":"graph","created_at":"2026-07-05T06:12:44Z","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/2302.05434/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Free-space time domain THz spectroscopy accesses electrodynamic responses in a frequency regime ideally matched to interacting condensed matter systems. However, THz spectroscopy is challenging when samples are physically smaller than the diffraction limit of ~0.5 mm, as is typical, for example, in van der Waals materials and heterostructures. Here, we present an on-chip, time-domain THz spectrometer based on semiconducting photoconductive switches with a bandwidth of 200 GHz to 750 GHz. We measure the optical conductivity of a 7.5-$\\mu$m wide NbN film across the superconducting transition, de","authors_text":"Abhay Nayak, Alex Potts, Andrea F. Young, Biljana Stamenic, Demis D. John, Kelson Kaj, Michael Nagel, Richard D. Averitt","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2023-02-10T18:51:15Z","title":"On-chip time-domain terahertz spectroscopy of superconducting films below the diffraction limit"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2302.05434","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":"sha256:2be6661bb03bdc2ccc895716c79d8b4b74b3eb447ef9b2f476dd531634a013ad","target":"record","created_at":"2026-07-05T06:12:44Z","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":"52ed8445571e127c7e46d12b32e321cd09efe5aabf30fed43c00d75f49f5bd07","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2023-02-10T18:51:15Z","title_canon_sha256":"4581fdd422868ea7ea206c1b128e8d5cfb147418a01e997d04117aef78a07d56"},"schema_version":"1.0","source":{"id":"2302.05434","kind":"arxiv","version":1}},"canonical_sha256":"0325969c7544f348ff3bd160f50754c9b5b09a7b3ffaa67e2c50231ef7d92948","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0325969c7544f348ff3bd160f50754c9b5b09a7b3ffaa67e2c50231ef7d92948","first_computed_at":"2026-07-05T06:12:44.407321Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:12:44.407321Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tliRU4vKpVkkKivv23siE2+PhnznFXii27VRmL1zCc9W3dpNmDwqxg9gWS3GVYbtSkICX89xUiITQoUcDKjKDA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:12:44.407787Z","signed_message":"canonical_sha256_bytes"},"source_id":"2302.05434","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2be6661bb03bdc2ccc895716c79d8b4b74b3eb447ef9b2f476dd531634a013ad","sha256:3f059f9ff2fc9abf04ff57f97cdb8de7998252b777b076b9cac93e17050f9e5d"],"state_sha256":"19aee5b4c2fbd4a7f54e9710424dabfe86106e057bcb3d806484977e88394345"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/cQJVmhWQw6VV3zhvK8kVMtsjQ1YdsQdU8SdC92WiHKScFRzgR+iO/7m/CC2i5+j6g7ObpcN0ZThNUgz3gswDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T09:35:56.215339Z","bundle_sha256":"f7f16acdf0e2b59b7103797634c76cd925dc9adc6076252da5666ac4201f3d06"}}