{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"bd9f632ec764a0136a69bc41b303024eabcb5d72402815703a0e824c5b58f6ab","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"5bb6dd45b316ca265745fefa194e206acd2f23d4058a4e047ce0a5adc08775b3","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"amo.rydberg-arrays.kagome-dirac-liquid","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Rydberg atoms can swap excitations with their neighbours, which makes a magnet with competing interactions on a kagome lattice. Calculations predict a spin liquid with massless particle-like excitations, and a 2026 experiment reported a candidate.","posed_since":"2024","precise":"Antiferromagnetic dipolar XY model H = J sum_i<j (a/r_ij)^3 (S_i^x S_j^x + S_i^y S_j^y), J > 0, on the kagome lattice, realized by resonant dipolar exchange between Rydberg states. Determine whether the ground state is the gapless $U(1)$ Dirac spin liquid predicted by DMRG (Bintz et al., arXiv:2406.00098), and whether finite arrays reach entropy low enough to distinguish it from a thermal paramagnet. Answer: correlation functions showing power-law decay with exponents matching the Dirac spin liquid (described by quantum electrodynamics in $2+1$ dimensions), or identification of a competing ordered state.","problem_ref":null,"references":"","settled_by":"Larger-cylinder numerics fixing the ground state, plus measurements on arrays of a few hundred atoms with independent thermometry showing the predicted correlation exponents.","status_note":"A 114-atom experiment reported a Dirac spin liquid candidate (Bornet et al., arXiv:2602.14323, 2026), while a 2026 thermometry analysis concluded that further experimental effort is needed to reach the putative spin liquid regime (Fitzner, Lesanovsky, Sbierski, arXiv:2604.22743).","title":"Is the kagome dipolar XY Rydberg magnet a Dirac spin 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