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Ultrafast spectroscopy of the quantum Hall ferromagnet

Su, B. ; Schröter, Patrick ; Heitmann, Detlef ; Perakis, Ilias. E. ; Wegscheider, Werner ; Schüller, Christian
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Date of publication of this fulltext: 25 Jan 2010 13:18


Abstract

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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