{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"ea484a41b97826c3b8fc348e56d30419416cf05f740e36ead5ed47dfa341223a","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["217bbcb15686a63641ddaae92d0d43bda4e71f4138cecb2fe76ea79f1cba4fa6","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"cbb4e8543e18c39427f4b1a816f2285bcf537c80c90f1c8b6295d3639905e8ae","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"cm.helium3-quantum-solids.slab-modulated-phase","kind":"well-posed","literature_status":"contested","n":"2","parents":[],"plain":"When helium-3 is confined in a slab about one ten-thousandth of a centimeter thick, theory predicts a superfluid phase whose order varies periodically along the slab, like stripes. Experiments disagree on whether this phase exists and what form it takes.","posed_since":"2007","precise":"In $3\\mathrm{He}$ confined to slabs of thickness $D \\sim 10^{-4}\\,\\mathrm{cm}$ with pair-breaking walls, quasiclassical theory predicts a stripe phase (Vorontsov and Sauls 2007) of periodic domain walls in a planar-distorted B order parameter, between the A and B phases. Determine whether a modulated phase exists, its period and its region in $\\left(D, P, T\\right)$, and distinguish a stripe phase from a pair-density-wave state and from a polar-distorted B phase with pinned domain walls. An answer is a phase diagram with direct evidence of the modulation.","problem_ref":"217bbcb15686a63641ddaae92d0d43bda4e71f4138cecb2fe76ea79f1cba4fa6","references":"","settled_by":"NMR line shapes or flow measurements in slabs of several thicknesses whose features match the predicted modulation period and its D dependence.","status_note":"NMR in a $1.1 \\times 10^{-4}$ cm slab (Levitin et al. 2019) gave evidence for a stripe phase; a nanofluidic resonator experiment (Shook et al. 2020) claimed a pair-density-wave state, and a 2020 Comment by Levitin et al. disputed that interpretation.","title":"Spatially modulated superfluid phase of 3He in thin 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