{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:664EHYHHAWBLGTHNF2KYTJJ4SQ","short_pith_number":"pith:664EHYHH","canonical_record":{"source":{"id":"1904.12757","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-04-29T14:56:15Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"9bd5abde481ee9a6ecce532053b82b6a4cd6f71a3356f52c3d31d0a43e7be998","abstract_canon_sha256":"5ad60689ce43cc59d3b0f20c3632dd33922607cc6d852869fc879c8431a8dfd8"},"schema_version":"1.0"},"canonical_sha256":"f7b843e0e70582b34ced2e9589a53c94050102c9642fd076b26ad9e31c394953","source":{"kind":"arxiv","id":"1904.12757","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.12757","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"arxiv_version","alias_value":"1904.12757v1","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.12757","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"pith_short_12","alias_value":"664EHYHHAWBL","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"pith_short_16","alias_value":"664EHYHHAWBLGTHN","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"pith_short_8","alias_value":"664EHYHH","created_at":"2026-07-04T23:52:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:664EHYHHAWBLGTHNF2KYTJJ4SQ","target":"record","payload":{"canonical_record":{"source":{"id":"1904.12757","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-04-29T14:56:15Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"9bd5abde481ee9a6ecce532053b82b6a4cd6f71a3356f52c3d31d0a43e7be998","abstract_canon_sha256":"5ad60689ce43cc59d3b0f20c3632dd33922607cc6d852869fc879c8431a8dfd8"},"schema_version":"1.0"},"canonical_sha256":"f7b843e0e70582b34ced2e9589a53c94050102c9642fd076b26ad9e31c394953","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:52:04.868781Z","signature_b64":"MQNTepqtdDVicSBvciOtVcXtsDwcAPvylgGNIUSkRbyyS92/NYl2JnZ8clEGFlsrkI3uexV7usv8wk5dOTL8Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f7b843e0e70582b34ced2e9589a53c94050102c9642fd076b26ad9e31c394953","last_reissued_at":"2026-07-04T23:52:04.868287Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:52:04.868287Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.12757","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":"2026-07-04T23:52:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WOBQOwukK5bjsiy5Ypxprc39J46Zh6Ax03+DrLa4aZazpq/3kCHRwoO30Dkyd/Ufw0YDEl3fmMYZx+r28GmeBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T10:08:38.464617Z"},"content_sha256":"ce5fb2e024b7cdb95924f88664e7ee61ec6f2d357973bae7e34cf32ad83af425","schema_version":"1.0","event_id":"sha256:ce5fb2e024b7cdb95924f88664e7ee61ec6f2d357973bae7e34cf32ad83af425"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:664EHYHHAWBLGTHNF2KYTJJ4SQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Angular Dependence of InP High Electron Mobility Transistors for Cryogenic Low Noise Amplifiers in a Magnetic Field","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"physics.app-ph","authors_text":"Arsalan Pourkabirian, David Niepce, Giuseppe Moschetti, Isabel Harrysson Rodrigues, Jan Grahn, Joel Schleeh, Thilo Bauch","submitted_at":"2019-04-29T14:56:15Z","abstract_excerpt":"The InGaAs-InAlAs-InP high electron mobility transistor (InP HEMT) is the preferred active device used in a cryogenic low noise amplifier (LNA) for sensitive detection of microwave signals. We observed that an InP HEMT 0.3-14GHz LNA at 2K, where the in-going transistors were oriented perpendicular to a magnetic field, heavily degraded in gain and average noise temperature already up to 1.5T. Dc measurements for InP HEMTs at 2K revealed a strong reduction in the transistor output current as a function of static magnetic field up to 14T. In contrast, the current reduction was insignificant when "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.12757","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/1904.12757/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":"2026-07-04T23:52:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u8FRidBuDHESL0GNFg1V8yCW4EZLErCvCESbFe8AWw9Ir0NH4f2GU1ub7S5ovR+E/66i+s5kVTzJPvbGJb6nAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T10:08:38.465137Z"},"content_sha256":"707beb5c59f91e808ef7e0f84d5664af727ccfdfbd693f2ece2a5e82ce622fc7","schema_version":"1.0","event_id":"sha256:707beb5c59f91e808ef7e0f84d5664af727ccfdfbd693f2ece2a5e82ce622fc7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/664EHYHHAWBLGTHNF2KYTJJ4SQ/bundle.json","state_url":"https://pith.science/pith/664EHYHHAWBLGTHNF2KYTJJ4SQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/664EHYHHAWBLGTHNF2KYTJJ4SQ/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":"2026-08-19T10:08:38Z","links":{"resolver":"https://pith.science/pith/664EHYHHAWBLGTHNF2KYTJJ4SQ","bundle":"https://pith.science/pith/664EHYHHAWBLGTHNF2KYTJJ4SQ/bundle.json","state":"https://pith.science/pith/664EHYHHAWBLGTHNF2KYTJJ4SQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/664EHYHHAWBLGTHNF2KYTJJ4SQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:664EHYHHAWBLGTHNF2KYTJJ4SQ","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":"5ad60689ce43cc59d3b0f20c3632dd33922607cc6d852869fc879c8431a8dfd8","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-04-29T14:56:15Z","title_canon_sha256":"9bd5abde481ee9a6ecce532053b82b6a4cd6f71a3356f52c3d31d0a43e7be998"},"schema_version":"1.0","source":{"id":"1904.12757","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.12757","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"arxiv_version","alias_value":"1904.12757v1","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.12757","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"pith_short_12","alias_value":"664EHYHHAWBL","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"pith_short_16","alias_value":"664EHYHHAWBLGTHN","created_at":"2026-07-04T23:52:04Z"},{"alias_kind":"pith_short_8","alias_value":"664EHYHH","created_at":"2026-07-04T23:52:04Z"}],"graph_snapshots":[{"event_id":"sha256:707beb5c59f91e808ef7e0f84d5664af727ccfdfbd693f2ece2a5e82ce622fc7","target":"graph","created_at":"2026-07-04T23:52:04Z","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/1904.12757/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The InGaAs-InAlAs-InP high electron mobility transistor (InP HEMT) is the preferred active device used in a cryogenic low noise amplifier (LNA) for sensitive detection of microwave signals. We observed that an InP HEMT 0.3-14GHz LNA at 2K, where the in-going transistors were oriented perpendicular to a magnetic field, heavily degraded in gain and average noise temperature already up to 1.5T. Dc measurements for InP HEMTs at 2K revealed a strong reduction in the transistor output current as a function of static magnetic field up to 14T. In contrast, the current reduction was insignificant when ","authors_text":"Arsalan Pourkabirian, David Niepce, Giuseppe Moschetti, Isabel Harrysson Rodrigues, Jan Grahn, Joel Schleeh, Thilo Bauch","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-04-29T14:56:15Z","title":"On the Angular Dependence of InP High Electron Mobility Transistors for Cryogenic Low Noise Amplifiers in a Magnetic Field"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.12757","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:ce5fb2e024b7cdb95924f88664e7ee61ec6f2d357973bae7e34cf32ad83af425","target":"record","created_at":"2026-07-04T23:52:04Z","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":"5ad60689ce43cc59d3b0f20c3632dd33922607cc6d852869fc879c8431a8dfd8","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-04-29T14:56:15Z","title_canon_sha256":"9bd5abde481ee9a6ecce532053b82b6a4cd6f71a3356f52c3d31d0a43e7be998"},"schema_version":"1.0","source":{"id":"1904.12757","kind":"arxiv","version":1}},"canonical_sha256":"f7b843e0e70582b34ced2e9589a53c94050102c9642fd076b26ad9e31c394953","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f7b843e0e70582b34ced2e9589a53c94050102c9642fd076b26ad9e31c394953","first_computed_at":"2026-07-04T23:52:04.868287Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:52:04.868287Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MQNTepqtdDVicSBvciOtVcXtsDwcAPvylgGNIUSkRbyyS92/NYl2JnZ8clEGFlsrkI3uexV7usv8wk5dOTL8Cg==","signature_status":"signed_v1","signed_at":"2026-07-04T23:52:04.868781Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.12757","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce5fb2e024b7cdb95924f88664e7ee61ec6f2d357973bae7e34cf32ad83af425","sha256:707beb5c59f91e808ef7e0f84d5664af727ccfdfbd693f2ece2a5e82ce622fc7"],"state_sha256":"92d232776a31744cd1c19eaf6c8de579ca73fa5f9e3e66679a84074771c80aa1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R8y/9CwdnKb3ld2WwwNhEPFm6oDx0qJ+1i7tVddi2wkypiv3q+MDrguBtJImIuAB2M4fi1nCAqCakgpE/ZKiDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-19T10:08:38.470400Z","bundle_sha256":"3c42bd5e9c872294ffb29757052526e4b62bb22293bfe50f59a788e233415ca7"}}