Oscillator strengths of dark charged excitons at low electron filling factors

DOI to cite this document:: 10.5283/epub.9496

Schüller, Christian ; Broocks, K.-B. ; Heyn, Ch. ; Heitmann, Detlef

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Date of publication of this fulltext: 21 Sep 2009 07:17

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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 ...