{
  "annotation_id": "84219952-fe0c-4ca9-9709-283540eb0637",
  "date_created": "2026-03-02T18:02:27.557000Z",
  "date_modified": "2026-03-02T18:02:27.557000Z",
  "file_hash": "89ec8be94dc2b57066591b312f71792d6a3f9ccfba9e68b7bfe5ad6cecec6229",
  "private": false,
  "record": {
    "abstract": "We discuss the recent proposal by Thommen and Mandel (Phys. Rev. Lett. {\\bf\n96}, 053601 (2006)) for electromagnetically induced negative refraction.\nAlthough the main conclusion of the paper -- the possibility to achieve\nnegative refraction in an experimentally accessible atomic scheme -- remains\nvalid, we show that the weak-excitation approximation used is invalid in the\nparameter regime studied and leads to quantitatively incorrect predictions. We\nshow that negative refraction is always accompanied by absorption rather than\nby gain, and that the maximum value of the refraction-absorption ratio is of\norder unity.",
    "arxiv_id": "quant-ph/0607150",
    "authors": [
      "J\u00fcrgen K\u00e4stel",
      "Michael Fleischhauer"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.98.069301",
    "title": "Comment on: \"Electromagnetically induced left-handedness in optically   excited four-level atomic media\"",
    "url": "https://arxiv.org/abs/quant-ph/0607150"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1ca91286-9025-424e-b483-a605f38c3af7",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}