{
  "annotation_id": "10f401cc-235f-48eb-bbd8-ef4036234e11",
  "date_created": "2026-03-02T18:02:34.659000Z",
  "date_modified": "2026-03-02T18:02:34.659000Z",
  "file_hash": "e6bb283a374d35541be823718262b788d8a603901d7528c7dc3a1e85e464ead7",
  "private": false,
  "record": {
    "abstract": "Using the standard Hamiltonian of the BCS theory, we show that in an ensemble\nof interacting fermions with the spin 1/2 there exist coherent states $|NC\u003e$,\nwhich nullify the Hamiltonian of the interparticle interaction (scattering).\nThese states have an analogy with the well-known in quantum optics the coherent\npopulation trapping (CPT) effect. The structure of these CPT-like states\ncorresponds to Cooper pairs with the total spin $S$=1. The found states have a\nhuge degree of degeneracy and carry a macroscopic magnetic moment, that allows\nus to construct a new model of the magnetism connected with the delocalized\nelectrons in metals (conductors). A principal possibility to apply the obtained\nresults to the superfluid $^3$He is also demonstrated.",
    "arxiv_id": "quant-ph/0702109",
    "authors": [
      "A. V. Taichenachev",
      "V. I. Yudin"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.str-el",
      "cond-mat.supr-con",
      "physics.atom-ph"
    ],
    "doi": "10.1140/epjd/e2008-00115-2",
    "title": "Vector Cooper Pairs and Coherent-Population-Trapping-like States in   Ensemble of Interacting Fermions",
    "url": "https://arxiv.org/abs/quant-ph/0702109"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "dda7ae82-02bf-42ba-8038-58071c19944e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}