Broocks, K.-B. and Ebeling, T. and Karsten, L. and Schüller, Christian and Heyn, Christian and Heitmann, Detlef
Electric Field Dependent Zeeman Splitting of Excitons in Diluted Two-Dimensional Electron Systems.
physica status solidi b 227 (2), pp. 339-342.
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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 ...
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