{
  "id": "cond-mat/0110152",
  "version": "v1",
  "published": "2001-10-08T15:02:53.000Z",
  "updated": "2001-10-08T15:02:53.000Z",
  "title": "Oscillator strengths of dark charged excitons in the quantum Hall regime",
  "authors": [
    "C. Schueller",
    "K. -B. Broocks",
    "Ch. Heyn",
    "D. Heitmann"
  ],
  "comment": "11 pages including figures, RevTeX, epsf",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "By direct absorption spectroscopy and comparison to photoluminescence (PL), we investigate negatively charged excitons in dilute two-dimensional electron systems at temperatures down to T=40 mK in the regime of the fractional quantum Hall effect. At very low temperatures, for filling factor \\nu < 1/3, an additional excitation appears in the PL spectrum, between the well-known singlet and triplet excitons. The observation of a similar excitation by PL was reported very recently [G. Yusa et al., cond-mat0103561], and the excitation was assigned, in spite of a PL intensity similar to that of the neutral exciton, to be due to a dark triplet exciton. By comparing PL and direct absorption spectra in optically thin samples at T<100 mK, we can identify the new excitation indeed as a 'dark' mode, since we find that the oscillator strength is much smaller than those of the 'bright' modes.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2001-10-08T15:02:53.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum hall regime",
      "dark charged excitons",
      "oscillator strength",
      "dilute two-dimensional electron systems",
      "fractional quantum hall effect"
    ],
    "note": {
      "typesetting": "RevTeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2001cond.mat.10152S"
    }
  }
}