{"paper":{"title":"Josephson Dynamics in 2D Ring-shaped Condensates","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"A ring-shaped Bose-Einstein condensate with two movable optical barriers supports a dc Josephson current up to a critical value before vortex pairs trigger dissipation while preserving global phase locking.","cross_cats":[],"primary_cat":"cond-mat.quant-gas","authors_text":"Koon Siang Gan, Luigi Amico, Rainer Dumke, Vijay Pal Singh","submitted_at":"2025-08-30T15:27:22Z","abstract_excerpt":"We investigate Josephson transport in a fully closed, two-dimensional superfluid circuit formed by a ring-shaped 87Rb Bose-Einstein condensate that contains two optical barriers acting as movable weak links. Translating these barriers at controlled speeds imposes a steady bias current, enabling direct mapping of the current-chemical-potential (I-{\\Delta}{\\mu}) characteristics. For narrow junctions (w \\approx 1{\\mu}m) the circuit exhibits a pronounced dc branch that terminates at a critical current I_c = 9(1) x 10^3 s^{-1}; above this threshold the system switches to an ac, resistive regime. Cl"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"For narrow junctions (w ≈ 1 μm) the circuit exhibits a pronounced dc branch that terminates at a critical current Ic = 9(1) × 10^3 s^{-1}; above this threshold the system switches to an ac, resistive regime with dissipation mediated by the nucleation and traversal of vortex-antivortex pairs while the bulk condensate remains globally phase-locked.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The two optical barriers function as movable weak links that impose a steady bias current while preserving the ring's topological constraint on quantized circulation.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A 2D ring BEC with two movable optical barriers shows a dc Josephson branch up to a measured critical current, after which vortex-antivortex pairs cause dissipation while the bulk remains phase-locked.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A ring-shaped Bose-Einstein condensate with two movable optical barriers supports a dc Josephson current up to a critical value before vortex pairs trigger dissipation while preserving global phase locking.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"1168e1cb43c3e59b6729093cf5b476252cd49e6601a30c28413dc6a10405ef5d"},"source":{"id":"2509.00533","kind":"arxiv","version":2},"verdict":{"id":"58815f85-e60d-4f9f-80c5-b228ec1b7fb8","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-18T20:33:11.213641Z","strongest_claim":"For narrow junctions (w ≈ 1 μm) the circuit exhibits a pronounced dc branch that terminates at a critical current Ic = 9(1) × 10^3 s^{-1}; above this threshold the system switches to an ac, resistive regime with dissipation mediated by the nucleation and traversal of vortex-antivortex pairs while the bulk condensate remains globally phase-locked.","one_line_summary":"A 2D ring BEC with two movable optical barriers shows a dc Josephson branch up to a measured critical current, after which vortex-antivortex pairs cause dissipation while the bulk remains phase-locked.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The two optical barriers function as movable weak links that impose a steady bias current while preserving the ring's topological constraint on quantized circulation.","pith_extraction_headline":"A ring-shaped Bose-Einstein condensate with two movable optical barriers supports a dc Josephson current up to a critical value before vortex pairs trigger dissipation while preserving global phase locking."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2509.00533/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":61,"sample":[{"doi":"","year":1962,"title":"B. D. Josephson, Possible new effects in superconductive tunnelling, Physics letters 1, 251 (1962)","work_id":"69be791e-a1f3-495c-8f90-f90519ce9a92","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1983,"title":"A. Barone and G. Patern` o, Josephson Effects: Basic Concepts (Springer, 1983)","work_id":"5e31419e-2d24-4374-93d6-44fe73f01410","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2004,"title":"Tinkham, Introduction to superconductivity (Courier Corporation, 2004)","work_id":"90e549ed-7045-44b0-8279-90e13bee8eb2","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2025,"title":"A. Rashidi, S. Ahadi, and S. Stemmer, Self-field-induced josephson diode effect, Nano Letters (2025)","work_id":"50a98462-2000-43f5-a28e-12d7044d6022","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2012,"title":"K. G. Fedorov, S. V. Shitov, H. Rotzinger, and A. V. Ustinov, Nonreciprocal microwave transmission through a long josephson junction, Physical Review B—Condensed Matter and Materials Physics 85, 18451","work_id":"f5ac8e4a-211e-405b-ae8c-aa081e9a3ac7","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":61,"snapshot_sha256":"f60536ea382e1342da32ce05ad3d3e14208712226aaa557026145758a43c4e0d","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"f968d7cd718f1fb7f81bda5362cde239b170fa646060383e7bfb74f1dfba8b65"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}