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Ultrafast spectroscopy of the quantum Hall ferromagnet

Authors
Publisher
Elsevier
Publication Date
Keywords
  • 530 Physik
Disciplines
  • Physics

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 observed slower decrease of the dephasing time for ν>1, as compared to ν<1, as a fingerprint of Skyrmion formation dynamics.

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