Oscillator strengths of dark charged excitons in the quantum Hall regime

Details Oscillator strengths of dark charged excitons in the quantum Hall regime Oscillator strengths of dark charged excitons in the quantum Hall regime

2001-10-08

arxiv.org/abs/cond-mat/0110152v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages including figures, RevTeX, epsf

Scientific paper

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.

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