Universal Multifractality in Quantum Hall Systems with Long-Range Disorder Potential

Abstract

We investigate numerically the localization-delocalization transition in quantum Hall systems with long-range disorder potential with respect to multifractal properties. Wavefunctions at the transition energy are obtained within the framework of the generalized Chalker--Coddington network model. We determine the critical exponent ${\alpha }_0$ characterizing the scaling behavior of the local order parameter for systems with potential correlation length $d$ up to $12$ magnetic lengths $l$. Our results show that ${\alpha }_0$ does not depend on the ratio $d/l$. With increasing $d/l$, effects due to classical percolation only cause an increase of the microscopic length scale, whereas the critical behavior on larger scales remains unchanged. This proves that systems with long-range disorder belong to the same universality class as those with short-range disorder.

4 pages, 2 figures, postsript, uuencoded, gz-compressed

References in corpus (3)

• Scaling Theory of the Integer Quantum Hall Effect
• Mutifractal Analysis of Broadly Distributed Observables at Criticality
• Relation between the Correlation Dimensions of Multifractal Wavefunctions and Spectral Measures in Integer Quantum Hall Systems

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