Electric Field Dependent Zeeman Splitting of Excitons in Diluted Two-Dimensional Electron Systems

DOI to cite this document:: 10.5283/epub.9630

Broocks, K.-B. ; Ebeling, T. ; Karsten, L. ; Schüller, Christian ; Heyn, Christian ; Heitmann, Detlef

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Date of publication of this fulltext: 02 Oct 2009 08:39

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Abstract

We investigate modulation-doped GaAs-AlGaAs quantum wells by photoluminescence spectroscopy. External gates allow us to tune the carrier densities below 1011 cm - 2, where we observe a crossover from an extended two-dimensional electron system to a regime where negatively charged excitons start to appear. By applying an external magnetic field, we can clearly resolve singlet and triplet excitons ...