We present data on finite frequency (0.2 ≤ f ≤ 8.6 GHz) conductivity, Re(σxx), 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(σxx) vs f evolves from a decreasing curve into a peak. The height and f of the peak increase with B. Integrals of Re(σxx) 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.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry
- A. Heterojunctions
- D. Fractional quantum Hall effect
- D. Quantum localization