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

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

1995-08-17

arxiv.org/abs/cond-mat/9508066v1

Europhys.Lett. 32 (1995) 229

Physics

Condensed Matter

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

Scientific paper

10.1209/0295-5075/32/3/007

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.

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