High Frequency Conductivity in the Quantum Hall Regime

F. Hohls, U. Zeitler, and R. J. Haug
Phys. Rev. Lett. 86, 5124 – Published 28 May 2001
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Abstract

We have measured the complex conductivity σxx 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 σxx 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 ξ. Even for large filling factor distances δν from the critical point we find ξδνγ with a scaling exponent γ=2.3.

  • Received 1 November 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.5124

©2001 American Physical Society

Authors & Affiliations

F. Hohls*, U. Zeitler, and R. J. Haug

  • Institut für Festkörperphysik, Universität Hannover, Applestrasse 2, 30167 Hannover, Germany

  • *Electronic address: hohls@nano.uni-hannover.de

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Vol. 86, Iss. 22 — 28 May 2001

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