Phys. Rev. Lett. 88, 036802 (2002) [4 pages]Hopping Conductivity in the Quantum Hall Effect: Revival of Universal ScalingReceived 16 July 2001; published 2 January 2002 We have measured the temperature dependence of the conductivity σxx of a two-dimensional electron system deep into the localized regime of the quantum Hall plateau transition. Using variable-range hopping theory we extract directly the localization length ξ from this experiment. We use our results to study the scaling behavior of ξ as a function of the filling factor distance |δν| to the critical point of the transition. We find for all samples a power-law behavior ξ∝|δν|-γ in agreement with the theoretically proposed universal exponent γ = 2.35. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.036802
DOI:
10.1103/PhysRevLett.88.036802
PACS:
73.43.-f, 71.23.An, 71.30.+h, 72.20.My
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