Su, B. and Schröter, Patrick and Heitmann, Detlef and Perakis, Ilias. E. and Wegscheider, Werner and Schüller, Christian
Ultrafast spectroscopy of the quantum Hall ferromagnet.
Physica E Low-dimensional Systems and Nanostructures 34 (1-2), pp. 381-384.
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We report ultrafast spectroscopy experiments at the ν=1 quantum Hall state of a high-mobility two-dimensional electron system in a GaAs single quantum well. By spectrally resolved four-wave-mixing measurements we investigate the coherent dynamics of photo-excited electron–hole pairs and find extraordinarily long decoherence times for electrons in the upper spin level around ν=1. We interpret the ...
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