{"paper":{"title":"Bipolaronic High-Temperature Superconductivity from Phonon-Modulated Hopping: A Perspective","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Phonon-modulated hopping creates light bipolarons that superconduct above the conventional temperature bound.","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"John Sous","submitted_at":"2026-05-15T20:46:05Z","abstract_excerpt":"Phonon-mediated superconductivity is conventionally thought to be capped at a transition temperature $T_{\\mathrm{c}}$ no larger than roughly one-tenth of the phonon frequency $\\Omega$, a bound rooted in the breakdown of Migdal-Eliashberg theory at intermediate coupling and in the heaviness of bipolarons formed in standard models with phonons that couple to the electron density. In this review I describe a route to phonon-mediated high-$T_{\\mathrm{c}}$ superconductivity that bypasses this bound. The key ingredient is a class of electron-phonon couplings in which lattice distortions modulate the"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Using sign-problem-free quantum Monte Carlo simulations of a bond-Peierls model on the square and cubic lattices, a dilute liquid of such bipolarons forms an s-wave superconductor with a Tc/Ω that significantly exceeds the conventional bound, that this conclusion is robust against screened Coulomb repulsion, and that Tc/Ω remains above the bound in presence of strong long-range Coulomb repulsion.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The premise that bipolarons formed by phonon-modulated hopping remain sufficiently light and mobile to condense into a dilute superconducting liquid at the simulated densities and couplings, rather than localizing or becoming heavy as in Holstein models; this enters via the instanton analysis and QMC results on specific lattices.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"In Peierls electron-phonon models, small but light bipolarons form a dilute s-wave superconductor with Tc/Ω exceeding the Migdal-Eliashberg bound, as shown by sign-problem-free QMC simulations that remain robust to Coulomb repulsion.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Phonon-modulated hopping creates light bipolarons that superconduct above the conventional temperature bound.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"239ea2c58f48317189194d0730ad5832861d5e56436f745ca74aa70df7b1aa30"},"source":{"id":"2605.16625","kind":"arxiv","version":1},"verdict":{"id":"ddff43d8-d407-4cd5-97b8-91682c8bc664","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T20:39:14.736775Z","strongest_claim":"Using sign-problem-free quantum Monte Carlo simulations of a bond-Peierls model on the square and cubic lattices, a dilute liquid of such bipolarons forms an s-wave superconductor with a Tc/Ω that significantly exceeds the conventional bound, that this conclusion is robust against screened Coulomb repulsion, and that Tc/Ω remains above the bound in presence of strong long-range Coulomb repulsion.","one_line_summary":"In Peierls electron-phonon models, small but light bipolarons form a dilute s-wave superconductor with Tc/Ω exceeding the Migdal-Eliashberg bound, as shown by sign-problem-free QMC simulations that remain robust to Coulomb repulsion.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The premise that bipolarons formed by phonon-modulated hopping remain sufficiently light and mobile to condense into a dilute superconducting liquid at the simulated densities and couplings, rather than localizing or becoming heavy as in Holstein models; this enters via the instanton analysis and QMC results on specific lattices.","pith_extraction_headline":"Phonon-modulated hopping creates light bipolarons that superconduct above the conventional temperature bound."},"integrity":{"clean":false,"summary":{"advisory":0,"critical":1,"by_detector":{"doi_compliance":{"total":1,"advisory":0,"critical":1,"informational":0}},"informational":0},"endpoint":"/pith/2605.16625/integrity.json","findings":[{"note":"Identifier '10.1088/0953-8984/20/4/043201' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. 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