Abstract
The critical exponent ν of the localization length in the integral quantum Hall regime can be measured directly using the Hall-bar geometries with different sizes. We obtain a universal behavior for the three lowest Landau levels. This is in agreement with the universality prediction of the field-theoretic approach to the metal-insulator transition in the quantum Hall effect. The value of ν=2.3±0.1 agrees with recent numerical studies for the lowest Landau level. The measured value of the temperature exponent of the inelastic-scattering rate is found to range from p=2.7±0.3 to p=3.4±0.4.
- Received 23 April 1991
DOI:https://doi.org/10.1103/PhysRevLett.67.883
©1991 American Physical Society