{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"4b200315ceab1d2ba8843f53712112cf2097aebca9d298a63c73fd1eb40f43b0","created":"2026-10-03T07:17:58Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"7377a203547fec77bf9fa503e40d4f2ed5e5e36d40f3f55c7599571def6d11f7","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.altermagnets.interaction-driven-altermagnetism","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Known altermagnets get their spin splitting from the arrangement of atoms in the crystal. Theory suggests that repulsion between electrons could create the same kind of spin-split state spontaneously, but no unbiased calculation has shown it in a simple model.","posed_since":"","precise":"Find a lattice model of interacting electrons (for example an extended Hubbard model with on-site U and nearest-neighbor V) whose paramagnetic phase has no symmetry-inequivalent magnetic sublattices and whose ground state spontaneously develops a d-wave or g-wave spin-split Fermi surface with zero net magnetization, established by unbiased numerics (DMRG, auxiliary-field quantum Monte Carlo or tensor networks) beyond mean-field theory. An answer is the model, the parameter range and the order parameter.","problem_ref":null,"references":"","settled_by":"An unbiased ground-state calculation with finite-size extrapolation of the spin-split order parameter in the proposed model.","status_note":"","title":"Can electron interactions alone produce altermagnetism?","topic_ref":"d1dd3aa250598657e4ca48074d196bb1f90d067794af9030bd5e3fb91972b41a"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b237632abcea2d5f8dec5aaeffc5f1a9fc4dc2a491ca26980c4b9b7df35e7f78","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"61f35c851fdf9c408bf753af0da498e7375e70b426f90a406e954582f9650d2d","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"FEDSlpbMo6wb3igDJwfMG5H0Ha4WFhpimbBubBjNqPb9xwDwsrPb0wMOikUeyHciyurAwl0wiW_WsgTAgc0aCg"},"schema":"pubphys.envelope/1"},"record_hash":"b237632abcea2d5f8dec5aaeffc5f1a9fc4dc2a491ca26980c4b9b7df35e7f78","leaf_index":902}