{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:LKJIJK6GCJ3LRY3XY4BNCBPVNP","short_pith_number":"pith:LKJIJK6G","canonical_record":{"source":{"id":"1305.5907","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-05-25T11:00:28Z","cross_cats_sorted":[],"title_canon_sha256":"4b6fb36dc93dd31b820f771591055ac692f75c3b47ea6a8d9bf18f8bcfd2be48","abstract_canon_sha256":"eb5f10a0f1a24328a5ba4e700d6ead66fcb5dc135648339cf241563ff90c2feb"},"schema_version":"1.0"},"canonical_sha256":"5a9284abc61276b8e377c702d105f56bdbec9c3a7d81776d25b1c0bd154521da","source":{"kind":"arxiv","id":"1305.5907","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.5907","created_at":"2026-05-18T02:56:19Z"},{"alias_kind":"arxiv_version","alias_value":"1305.5907v1","created_at":"2026-05-18T02:56:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.5907","created_at":"2026-05-18T02:56:19Z"},{"alias_kind":"pith_short_12","alias_value":"LKJIJK6GCJ3L","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_16","alias_value":"LKJIJK6GCJ3LRY3X","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_8","alias_value":"LKJIJK6G","created_at":"2026-05-18T12:27:51Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:LKJIJK6GCJ3LRY3XY4BNCBPVNP","target":"record","payload":{"canonical_record":{"source":{"id":"1305.5907","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-05-25T11:00:28Z","cross_cats_sorted":[],"title_canon_sha256":"4b6fb36dc93dd31b820f771591055ac692f75c3b47ea6a8d9bf18f8bcfd2be48","abstract_canon_sha256":"eb5f10a0f1a24328a5ba4e700d6ead66fcb5dc135648339cf241563ff90c2feb"},"schema_version":"1.0"},"canonical_sha256":"5a9284abc61276b8e377c702d105f56bdbec9c3a7d81776d25b1c0bd154521da","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:56:19.140833Z","signature_b64":"j1El8IjufaKEPj48DZ/ercCTyXh32BlfKG5ql6RvoKCNrMnauGf4folYh1jiuIzUFSPtBeHekrUFWDWQlKeECQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5a9284abc61276b8e377c702d105f56bdbec9c3a7d81776d25b1c0bd154521da","last_reissued_at":"2026-05-18T02:56:19.140303Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:56:19.140303Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1305.5907","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":"2026-05-18T02:56:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z5oy3GSNpj3Ii6QwPlhy4P4CstFV8kcTLQt05fuyShNxmeefrNNkfsciPoVcq5O1B8+c3r3M06jDPYrdM8DLAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:50:35.550264Z"},"content_sha256":"aced8624d2b8c987ed57edd18764004e20d6bd976678da9eee16221133dfeb04","schema_version":"1.0","event_id":"sha256:aced8624d2b8c987ed57edd18764004e20d6bd976678da9eee16221133dfeb04"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:LKJIJK6GCJ3LRY3XY4BNCBPVNP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Phonon excitation and instabilities in biased graphene nanoconstrictions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Jing-Tao L\\\"u, Mads Brandbyge, Per Hedeg{\\aa}rd, Tue Gunst","submitted_at":"2013-05-25T11:00:28Z","abstract_excerpt":"We calculate the phonons in a graphene nanoconstriction(GNC) in the presence of a high current density. The Joule-heating, current-induced forces, and coupling to electrode phonons is evaluated using first principles nonequilibrium DFT-NEGF calculations. Close to a resonance in the electronic structure we observe a strongly nonlinear heating with bias and breakdown of the harmonic approximation. This behavior results from negatively damped phonons driven by the current. The effect may limit the stability and capacity of graphene nanoconstrictions to carry high currents."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.5907","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":""},"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":"2026-05-18T02:56:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2XXPm4ujFdKU7AXAOoGV60HsRlv3yIVNj3d3EcwjgsF8xeqHVrduUaxTuEVE1AZCoBh4neUhH/uT+eU8NNTmDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:50:35.550630Z"},"content_sha256":"651dcb803604a6b98c8d65a630f0f828e6481089b4b6fe9eb70380303ed2670e","schema_version":"1.0","event_id":"sha256:651dcb803604a6b98c8d65a630f0f828e6481089b4b6fe9eb70380303ed2670e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LKJIJK6GCJ3LRY3XY4BNCBPVNP/bundle.json","state_url":"https://pith.science/pith/LKJIJK6GCJ3LRY3XY4BNCBPVNP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LKJIJK6GCJ3LRY3XY4BNCBPVNP/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":"2026-06-03T17:50:35Z","links":{"resolver":"https://pith.science/pith/LKJIJK6GCJ3LRY3XY4BNCBPVNP","bundle":"https://pith.science/pith/LKJIJK6GCJ3LRY3XY4BNCBPVNP/bundle.json","state":"https://pith.science/pith/LKJIJK6GCJ3LRY3XY4BNCBPVNP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LKJIJK6GCJ3LRY3XY4BNCBPVNP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:LKJIJK6GCJ3LRY3XY4BNCBPVNP","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":"eb5f10a0f1a24328a5ba4e700d6ead66fcb5dc135648339cf241563ff90c2feb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-05-25T11:00:28Z","title_canon_sha256":"4b6fb36dc93dd31b820f771591055ac692f75c3b47ea6a8d9bf18f8bcfd2be48"},"schema_version":"1.0","source":{"id":"1305.5907","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.5907","created_at":"2026-05-18T02:56:19Z"},{"alias_kind":"arxiv_version","alias_value":"1305.5907v1","created_at":"2026-05-18T02:56:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.5907","created_at":"2026-05-18T02:56:19Z"},{"alias_kind":"pith_short_12","alias_value":"LKJIJK6GCJ3L","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_16","alias_value":"LKJIJK6GCJ3LRY3X","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_8","alias_value":"LKJIJK6G","created_at":"2026-05-18T12:27:51Z"}],"graph_snapshots":[{"event_id":"sha256:651dcb803604a6b98c8d65a630f0f828e6481089b4b6fe9eb70380303ed2670e","target":"graph","created_at":"2026-05-18T02:56:19Z","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 calculate the phonons in a graphene nanoconstriction(GNC) in the presence of a high current density. The Joule-heating, current-induced forces, and coupling to electrode phonons is evaluated using first principles nonequilibrium DFT-NEGF calculations. Close to a resonance in the electronic structure we observe a strongly nonlinear heating with bias and breakdown of the harmonic approximation. This behavior results from negatively damped phonons driven by the current. The effect may limit the stability and capacity of graphene nanoconstrictions to carry high currents.","authors_text":"Jing-Tao L\\\"u, Mads Brandbyge, Per Hedeg{\\aa}rd, Tue Gunst","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-05-25T11:00:28Z","title":"Phonon excitation and instabilities in biased graphene nanoconstrictions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.5907","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:aced8624d2b8c987ed57edd18764004e20d6bd976678da9eee16221133dfeb04","target":"record","created_at":"2026-05-18T02:56:19Z","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":"eb5f10a0f1a24328a5ba4e700d6ead66fcb5dc135648339cf241563ff90c2feb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-05-25T11:00:28Z","title_canon_sha256":"4b6fb36dc93dd31b820f771591055ac692f75c3b47ea6a8d9bf18f8bcfd2be48"},"schema_version":"1.0","source":{"id":"1305.5907","kind":"arxiv","version":1}},"canonical_sha256":"5a9284abc61276b8e377c702d105f56bdbec9c3a7d81776d25b1c0bd154521da","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5a9284abc61276b8e377c702d105f56bdbec9c3a7d81776d25b1c0bd154521da","first_computed_at":"2026-05-18T02:56:19.140303Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:56:19.140303Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"j1El8IjufaKEPj48DZ/ercCTyXh32BlfKG5ql6RvoKCNrMnauGf4folYh1jiuIzUFSPtBeHekrUFWDWQlKeECQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:56:19.140833Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.5907","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aced8624d2b8c987ed57edd18764004e20d6bd976678da9eee16221133dfeb04","sha256:651dcb803604a6b98c8d65a630f0f828e6481089b4b6fe9eb70380303ed2670e"],"state_sha256":"217b89488e0664a94a4c9baf6a7b49a526e4c6a2e22d8cdf4c7419f70b2d5e27"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N9bZDySFx9LtkraoB03LBgbWuvgKQiDpipWpsDwb5SKU6lJBI82YIBRwOUtuB/B44i0HStgJCPllAIAvKeBgBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T17:50:35.552537Z","bundle_sha256":"48e20bb0e662d7b0c077bd9913cef77a8282167250b3324fc52a15d0dfaf917c"}}