{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:NTGZ4E7GH4ANBVC2X6H6LOH3SC","short_pith_number":"pith:NTGZ4E7G","canonical_record":{"source":{"id":"1908.06924","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-19T16:50:57Z","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.mtrl-sci"],"title_canon_sha256":"9010f5815cb1c16a12a21aa73d1003bbdf8a502f7d491f104ca953f0fd1ff9e2","abstract_canon_sha256":"f51c70c3c42364287916d64858f1dd2c46e72e7ce4373a4c738dd765e07e1bbc"},"schema_version":"1.0"},"canonical_sha256":"6ccd9e13e63f00d0d45abf8fe5b8fb90af5647443e83f6991efac743d7ec4d35","source":{"kind":"arxiv","id":"1908.06924","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.06924","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"arxiv_version","alias_value":"1908.06924v1","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.06924","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"pith_short_12","alias_value":"NTGZ4E7GH4AN","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"pith_short_16","alias_value":"NTGZ4E7GH4ANBVC2","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"pith_short_8","alias_value":"NTGZ4E7G","created_at":"2026-07-04T23:58:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:NTGZ4E7GH4ANBVC2X6H6LOH3SC","target":"record","payload":{"canonical_record":{"source":{"id":"1908.06924","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-19T16:50:57Z","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.mtrl-sci"],"title_canon_sha256":"9010f5815cb1c16a12a21aa73d1003bbdf8a502f7d491f104ca953f0fd1ff9e2","abstract_canon_sha256":"f51c70c3c42364287916d64858f1dd2c46e72e7ce4373a4c738dd765e07e1bbc"},"schema_version":"1.0"},"canonical_sha256":"6ccd9e13e63f00d0d45abf8fe5b8fb90af5647443e83f6991efac743d7ec4d35","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:58:21.259600Z","signature_b64":"LVbIN2f6ggaXQBS0g2awlphnm3gnMM15+hVH+6L2UVYuUNlomWyqxJEkeKBuTtOrIGsfYbbYrfvXrEh1hdALCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6ccd9e13e63f00d0d45abf8fe5b8fb90af5647443e83f6991efac743d7ec4d35","last_reissued_at":"2026-07-04T23:58:21.259165Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:58:21.259165Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.06924","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":"2026-07-04T23:58:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GZU8RlhjyavukUrga9k1IdBZ5BT9+/I2Y8PghaGbj4OUhsrpAeFMzZ8dHYutATuCsXM9Ah+i+SODGDjcYvoJBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T06:33:36.372362Z"},"content_sha256":"e00cba571382022879166837053f803a7d2cf5de0d7b7c959fe86fbfc5f2fa33","schema_version":"1.0","event_id":"sha256:e00cba571382022879166837053f803a7d2cf5de0d7b7c959fe86fbfc5f2fa33"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:NTGZ4E7GH4ANBVC2X6H6LOH3SC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Highly Sensitive, Fast Graphene Photodetector with Responsivity $>10^6$ A/W Using Floating Quantum Well Gate","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall","cond-mat.mtrl-sci"],"primary_cat":"physics.app-ph","authors_text":"Kausik Majumdar, Krishna Murali, Nithin Abraham, Sangeeth Kallatt, Sarthak Das","submitted_at":"2019-08-19T16:50:57Z","abstract_excerpt":"Graphene, owing to its zero bandgap electronic structure, is promising as an absorption material for ultra-wideband photodetection applications. However, graphene-absorption based detectors inherently suffer from poor responsivity due to weak absorption and fast photocarrier recombination, limiting their viability for low intensity light detection. Here we use a graphene/WS$_2$/MoS$_2$ vertical heterojunction to demonstrate a highly sensitive photodetector, where the graphene layer serves dual purpose, namely as the light absorption layer, and also as the carrier conduction channel, thus maint"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.06924","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/1908.06924/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":"2026-07-04T23:58:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zwpXg7OFtZC7LRBXDGNY0j8QpdK9287OlTuPHnyDAxwL/XVr2X/c8o+C261ytg0gFyuJI4+LxZAqr+Sq+yFbAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T06:33:36.372863Z"},"content_sha256":"ce5ea17ea9f46955c927ee73812d62037af5d1c3c9458a379a4ade363e910692","schema_version":"1.0","event_id":"sha256:ce5ea17ea9f46955c927ee73812d62037af5d1c3c9458a379a4ade363e910692"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NTGZ4E7GH4ANBVC2X6H6LOH3SC/bundle.json","state_url":"https://pith.science/pith/NTGZ4E7GH4ANBVC2X6H6LOH3SC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NTGZ4E7GH4ANBVC2X6H6LOH3SC/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":"2026-08-16T06:33:36Z","links":{"resolver":"https://pith.science/pith/NTGZ4E7GH4ANBVC2X6H6LOH3SC","bundle":"https://pith.science/pith/NTGZ4E7GH4ANBVC2X6H6LOH3SC/bundle.json","state":"https://pith.science/pith/NTGZ4E7GH4ANBVC2X6H6LOH3SC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NTGZ4E7GH4ANBVC2X6H6LOH3SC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:NTGZ4E7GH4ANBVC2X6H6LOH3SC","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":"f51c70c3c42364287916d64858f1dd2c46e72e7ce4373a4c738dd765e07e1bbc","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-19T16:50:57Z","title_canon_sha256":"9010f5815cb1c16a12a21aa73d1003bbdf8a502f7d491f104ca953f0fd1ff9e2"},"schema_version":"1.0","source":{"id":"1908.06924","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.06924","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"arxiv_version","alias_value":"1908.06924v1","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.06924","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"pith_short_12","alias_value":"NTGZ4E7GH4AN","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"pith_short_16","alias_value":"NTGZ4E7GH4ANBVC2","created_at":"2026-07-04T23:58:21Z"},{"alias_kind":"pith_short_8","alias_value":"NTGZ4E7G","created_at":"2026-07-04T23:58:21Z"}],"graph_snapshots":[{"event_id":"sha256:ce5ea17ea9f46955c927ee73812d62037af5d1c3c9458a379a4ade363e910692","target":"graph","created_at":"2026-07-04T23:58:21Z","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/1908.06924/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Graphene, owing to its zero bandgap electronic structure, is promising as an absorption material for ultra-wideband photodetection applications. However, graphene-absorption based detectors inherently suffer from poor responsivity due to weak absorption and fast photocarrier recombination, limiting their viability for low intensity light detection. Here we use a graphene/WS$_2$/MoS$_2$ vertical heterojunction to demonstrate a highly sensitive photodetector, where the graphene layer serves dual purpose, namely as the light absorption layer, and also as the carrier conduction channel, thus maint","authors_text":"Kausik Majumdar, Krishna Murali, Nithin Abraham, Sangeeth Kallatt, Sarthak Das","cross_cats":["cond-mat.mes-hall","cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-19T16:50:57Z","title":"Highly Sensitive, Fast Graphene Photodetector with Responsivity $>10^6$ A/W Using Floating Quantum Well Gate"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.06924","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:e00cba571382022879166837053f803a7d2cf5de0d7b7c959fe86fbfc5f2fa33","target":"record","created_at":"2026-07-04T23:58:21Z","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":"f51c70c3c42364287916d64858f1dd2c46e72e7ce4373a4c738dd765e07e1bbc","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2019-08-19T16:50:57Z","title_canon_sha256":"9010f5815cb1c16a12a21aa73d1003bbdf8a502f7d491f104ca953f0fd1ff9e2"},"schema_version":"1.0","source":{"id":"1908.06924","kind":"arxiv","version":1}},"canonical_sha256":"6ccd9e13e63f00d0d45abf8fe5b8fb90af5647443e83f6991efac743d7ec4d35","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6ccd9e13e63f00d0d45abf8fe5b8fb90af5647443e83f6991efac743d7ec4d35","first_computed_at":"2026-07-04T23:58:21.259165Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:58:21.259165Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LVbIN2f6ggaXQBS0g2awlphnm3gnMM15+hVH+6L2UVYuUNlomWyqxJEkeKBuTtOrIGsfYbbYrfvXrEh1hdALCw==","signature_status":"signed_v1","signed_at":"2026-07-04T23:58:21.259600Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.06924","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e00cba571382022879166837053f803a7d2cf5de0d7b7c959fe86fbfc5f2fa33","sha256:ce5ea17ea9f46955c927ee73812d62037af5d1c3c9458a379a4ade363e910692"],"state_sha256":"d2380642b737ac3a69a6ee0e841644b9d89758c62e01aa28446c73a7720c22f3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GpVS1QHgkPpkVrQyqGrIuG1m0NTFMuJHB6XEcYIsDz1NTtmlOZx/IYIlt1IJFs9B05gEeSlWOeGACtSkcxMrCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T06:33:36.377224Z","bundle_sha256":"9bc24b2aa0e4628c4faf892889d0f8e71da7d0f803d5ace5f8d3233b120ea15b"}}