Oscillator strengths of dark charged excitons in the quantum Hall regime

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dc.creatorSchueller, C.
dc.creatorBroocks, K. -B.
dc.creatorHeyn, Ch.
dc.creatorHeitmann, D.
dc.date2001-10-08
dc.date.accessioned2026-07-07T02:42:57Z
dc.date.available2026-07-07T02:42:57Z
dc.descriptionBy 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 ν< 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.
dc.description11 pages including figures, RevTeX, epsf
dc.identifierhttps://arxiv.org/abs/cond-mat/0110152
dc.identifierhttp://arxiv.org/abs/cond-mat/0110152
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/18354
dc.subjectMesoscale and Nanoscale Physics
dc.titleOscillator strengths of dark charged excitons in the quantum Hall regime
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