In dc transport measurements of two-dimensional electron systems containing a small charge density modulation in one direction, resonance structure in resistance is observed near filling factor 1/2. For a sufficiently well-controlled modulation amplitude, the magnetic field positions of these distinct resistance minima are consistent with values for a periodic magnetic modulation as predicted in a Chern-Simons fermion picture of ν0ex0ex=0ex0ex1/2.
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Willett et al. (1999) studied this question.
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