{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"6ce9d19b95761d94784b01f99185f29fcfe715aae33bf3cbb599418dcab796c3","created":"2026-10-03T07:17:53Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"a4c6f09f6ccfdb8623686cfc9f428fb8950190215533d5a48764947668eafc21","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"amo.hubbard-simulation.stripes-plain-2d","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"In some cuprates the holes line up in rows separated by magnetic stripes. Atom experiments saw stripes form in a simplified version of the model where holes move only along one direction; the full two-dimensional case has not shown them.","posed_since":"","precise":"Square-lattice Fermi-Hubbard model with isotropic hopping, $U/t = 8 \\text{ to } 10$, $\\delta = 1/8$, $t'/t = 0 \\text{ and } -0.2$, imaged by quantum gas microscopy. Measure spin-spin and hole-hole correlation functions and determine whether unidirectional stripe correlations with wavelength set by the doping appear at the lowest accessible $T/t$ (about 0.05 to 0.1). Answer: stripe correlation length versus $T/t$ and t', compared with finite-temperature numerics.","problem_ref":null,"references":"","settled_by":"Microscope snapshots of a doped isotropic 2D lattice showing stripe correlations over several periods, matched to numerics at the measured temperature.","status_note":"Individual stripes were observed in a mixed-dimensional Fermi-Hubbard system in which holes hop only along one axis (Bourgund et al., Nature 2025, doi:10.1038/s41586-024-08270-7); no isotropic 2D observation was found in a 2026 arXiv search.","title":"Do spin-charge stripes appear in an isotropic two-dimensional Hubbard 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