Ultrafast spectroscopy of the quantum Hall ferromagnet

Academic Article

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. © 2006 Elsevier B.V. All rights reserved.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Su B; Schröter P; Heitmann D; Perakis IE; Wegscheider W; Schüller C
  • Start Page

  • 381
  • End Page

  • 384
  • Volume

  • 34
  • Issue

  • 1-2