Abstract
We have measured the complex conductivity of a two-dimensional electron system in the quantum Hall regime up to frequencies of 6 GHz at electron temperatures below 100 mK. Using both its imaginary and real part we show that can be scaled to a single function for different frequencies and several transitions between plateaus in the quantum Hall effect. Additionally, the conductivity in the variable-range hopping regime is used for a direct evaluation of the localization length . Even for large filling factor distances from the critical point we find with a scaling exponent .
- Received 1 November 2000
DOI:https://doi.org/10.1103/PhysRevLett.86.5124
©2001 American Physical Society