{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"48123f183fb923c934b92927b189fb8bfaa525ddd60f3d7bd343d63c73ebcfa0","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"4039271d4271655e7097e637dc789c428ee67a910ecffea591c48cb2c562f807","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"cm.moire-tmd-hubbard.wigner-crystal-melting","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"At fractional fillings such as one electron per three moire sites, electrons in WSe2/WS2 order into crystals because of their repulsion (generalized Wigner crystals), and how these crystals turn into metals as the repulsion is weakened is unknown.","posed_since":"2020","precise":"In WSe2/WS2 and similar heterobilayers, insulating states at fractional fillings $\\nu = 1/3, 1/2, 2/3$ and others were detected optically (Regan et al., Nature, 2020, arXiv:1910.09047) and later imaged. As the ratio of Coulomb energy to bandwidth, or the screening length set by gate distance, is reduced, determine whether each crystal melts into a Fermi liquid directly (first or second order) or through intermediate phases such as stripes, bubbles, microemulsions or a quantum-melted state without charge order but with insulating transport. An answer is a phase diagram versus $\\nu$ and screening length with the order of each transition.","problem_ref":null,"references":"","settled_by":"Local imaging of charge order versus gate distance and density, with compressibility measurements locating each transition and its hysteresis.","status_note":"","title":"Quantum melting of generalized Wigner crystals in moire 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