{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"545fa9491f2ede9a9a734320a2ecf59fb2d338c3a8bfa1016d2f9eed114e63f0","created":"2026-10-03T07:17:53Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"511e4ebebaf06a4d180f6c1b22508494dcdfe2de1dba45bd634a772eef8a0aff","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"amo.efimov-universality.super-efimov-observation","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Theory predicts that identical fermions confined to a plane and tuned to a resonance with one unit of rotation bind in threes, with an infinite ladder of trimers whose energies shrink double-exponentially. No experiment has seen this ladder.","posed_since":"2013","precise":"Spin-polarized fermions in 2D at a p-wave Feshbach resonance in a single orbital channel $l = +1$ or $l = -1$. Nishida, Moroz and Son (PRL 2013) predict trimers with $l = +1$ or $-1$ and binding energies $E_n \\sim \\exp(-2 \\exp(3 \\pi n/4 + \\theta))$, proven rigorously by Gridnev (2014). Answer: observation of at least two trimer features (three-body loss or spectroscopic) whose positions follow the $3 \\pi/4$ double-exponential law, or a quantified demonstration that p-wave two-body losses preclude it.","problem_ref":null,"references":"","settled_by":"Three-body loss or radio-frequency spectroscopy in a quasi-2D single-component Fermi gas near a channel-resolved p-wave resonance showing two trimer features at the predicted ratio.","status_note":"Theoretical follow-ups continued through 2025 and a related dynamical super-Efimovian expansion of a unitary gas was observed in 2017 (arXiv:1707.06732), but the super Efimov trimers have not been observed.","title":"Observation of the super Efimov tower in two-dimensional p-wave fermions","topic_ref":"339b6d63b4f6e3414be07628eacf49cfd6937fceb21d43c10a8b4202c093ede0"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"e28a702de4f1ab5a0e3dba31c916668d8b8398805dc506854027861bb67842f9","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"e215e2aaab36d05f6d34a05c695f04e1d2df29b5b7914de5b107b96e55f902d6","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Uduu-RtpFvs7jRzgh4Kw5Q8JrL2IkdOPIT919UA2jE7VP6wUAXVJdyEmIPjtk6StlWxGXkDMaHpXHyPRLPeVAw"},"schema":"pubphys.envelope/1"},"record_hash":"e28a702de4f1ab5a0e3dba31c916668d8b8398805dc506854027861bb67842f9","leaf_index":403}