{
  "id": "1109.2456",
  "version": "v2",
  "published": "2011-09-12T13:19:00.000Z",
  "updated": "2011-12-08T10:49:11.000Z",
  "title": "Phase transitions and dark-state physics in two-color superradiance",
  "authors": [
    "Mathias Hayn",
    "Clive Emary",
    "Tobias Brandes"
  ],
  "comment": "9 pages, 6 figures",
  "journal": "Phys. Rev. A 84, 053856 (2011)",
  "doi": "10.1103/PhysRevA.84.053856",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We theoretically study an extension of the Dicke model, where the single-particle Hamiltonian has three energy levels in Lambda-configuration, i.e. the excited state is coupled to two non-degenerate ground states via two independent quantized light fields. The corresponding many-body Hamiltonian can be diagonalized in the thermodynamic limit with the help of a generalized Holstein--Primakoff transformation. Analyzing the ground-state energy and the excitation energies, we identify one normal and two superradiant phases, separated by phase transitions of both first and second order. A phase with both superradiant states coexisting is not stable. In addition, in the limit of two degenerate ground states a dark state emerges, which seems to be analogous to the dark state appearing in the well known stimulated Raman adiabatic passage scheme.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2011-12-08T10:49:11.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "42.50.Nn",
      "05.30.Rt",
      "32.80.Qk",
      "32.90.+a"
    ],
    "keywords": [
      "phase transitions",
      "dark-state physics",
      "two-color superradiance",
      "stimulated raman adiabatic passage scheme",
      "independent quantized light fields"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2011,
      "month": "Nov",
      "volume": 84,
      "number": 5,
      "pages": "053856"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2011PhRvA..84e3856H"
    }
  }
}