{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:HAVV6OU66RPQCMXSTZCA7GTO4P","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":"7ca9619c82887e4a4bb09cc923965be874e7f17f768c099105f24cc85c41aaa3","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-03-25T21:18:44Z","title_canon_sha256":"b1f7dde3f7be37a37b466badfe996722fcb3d0cc87f7558a9c14b70be6bc7984"},"schema_version":"1.0","source":{"id":"0903.4445","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.4445","created_at":"2026-05-18T03:46:59Z"},{"alias_kind":"arxiv_version","alias_value":"0903.4445v1","created_at":"2026-05-18T03:46:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.4445","created_at":"2026-05-18T03:46:59Z"},{"alias_kind":"pith_short_12","alias_value":"HAVV6OU66RPQ","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HAVV6OU66RPQCMXS","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HAVV6OU6","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:b9ec38b0dbd38382b8307e9f07a775c3add8fb0ccc9aeda04d233a222edb55bb","target":"graph","created_at":"2026-05-18T03:46:59Z","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":"The possibility of excitonic condensation in a recently proposed electrically biased double-layer graphene system is studied theoretically. The main emphasis is put on obtaining a reliable analytical estimate for the transition temperature into the excitonic state. As in a double-layer graphene system the total number of fermionic \"flavors\" is equal to N=8 due to two projections of spin, two valleys, and two layers, the large-$N$ approximation appears to be especially suitable for theoretical investigation of the system. On the other hand, the large number of flavors makes screening of the bar","authors_text":"Konstantin B. Efetov, Maxim Yu. Kharitonov","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-03-25T21:18:44Z","title":"Excitonic condensation in a double-layer graphene system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.4445","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":"sha256:2167346abb29ffe6687aad9f4d397d6b4714c0ec5f38fd99894eb76df7a5ec91","target":"record","created_at":"2026-05-18T03:46:59Z","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":"7ca9619c82887e4a4bb09cc923965be874e7f17f768c099105f24cc85c41aaa3","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-03-25T21:18:44Z","title_canon_sha256":"b1f7dde3f7be37a37b466badfe996722fcb3d0cc87f7558a9c14b70be6bc7984"},"schema_version":"1.0","source":{"id":"0903.4445","kind":"arxiv","version":1}},"canonical_sha256":"382b5f3a9ef45f0132f29e440f9a6ee3d49000b7243cacb571b13bea87bec8c1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"382b5f3a9ef45f0132f29e440f9a6ee3d49000b7243cacb571b13bea87bec8c1","first_computed_at":"2026-05-18T03:46:59.218599Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:46:59.218599Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"i47pT/9uBZO2/7yrE3iFkYVXliKDmKtH8ydAgU0ASg41nRguDxkl7pYioNl2w2ds0M7FLMy8eD54Rs3PoMFHDw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:46:59.219212Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.4445","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2167346abb29ffe6687aad9f4d397d6b4714c0ec5f38fd99894eb76df7a5ec91","sha256:b9ec38b0dbd38382b8307e9f07a775c3add8fb0ccc9aeda04d233a222edb55bb"],"state_sha256":"07fedc7cc3514d71d09138d72a9da8a1e906c7e4125a1eeb0b08dc56efc5fd7d"}