Commensurability Oscillations of Hole-Flux Composite Fermions

Abstract

We report the observation of commensurability oscillations of hole-flux composite fermions near a filling factor of ν=1/2 in a high-mobility two-dimensional hole system confined to a GaAs quantum well and subjected to a weak, strain-induced, unidirectional periodic potential modulation. The oscillations, which are consistent with ballistic transport of fully spin-polarized composite fermions in a weak periodic effective magnetic field, are surprisingly strong and exhibit up to third-order minima. We extract a ballistic mean-free path of about 0.1 μm for the hole-flux composite fermions.