Quantum Hall measurements are performed for a two-dimensional hole system (2DHS) confined to a 20 nm quantum well in GaAs. Quantum oscillations reveal a density of with mobility μ = 1 × 106 cm2/V s. For temperatures less than ∼350 mK, anomalous insulating peaks are observed between integer fillings 1-2, 2-3, and 3-4. A large out-of-phase signal appears at these peaks, which indicates a substantial inductance inherent to the charge carriers.
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