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Abstract:
Photoluminescence excitation spectra of a two-dimensional valence hole
gas with large spin gap and strong disorder are studied in high
magnetic fields. The characteristic field dependence of polarized
emission associated with transitions from the lowest hole Landau level
(LL) is the signature of quantum Hall ferromagnetism and small
skyrmions around the LL filling factor nu=1. This interpretation is
supported by realistic numerical calculations of the skyrmion binding
energy.
