Abstract
We present data on finite frequency (0.2 ≤ f ≤ 8.6 GHz) conductivity, Re( σ xx ), of the insulator terminating a fractional quantum Hall effect series in the high magnetic field ( B) limit. As B is increased within the insulator, at temperatures of 50 and 200 mK Re( σ xx ) vs f evolves from a decreasing curve into a peak. The height and f of the peak increase with B. Integrals of Re( σ xx ) vs f become B-independent at large enough B. The results are discussed within the framework of the Fukuyama-Lee model of the dynamics of a pinned Wigner crystal.
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