Commensurability oscillations of hole-flux composite fermions.
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.
Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
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Kamburov
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Shayegan
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Pfeiffer
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West
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Baldwin