Hidden Scaling in the Quantum Hall Metal-Insulator Transition

Details Hidden Scaling in the Quantum Hall Metal-Insulator Transition Hidden Scaling in the Quantum Hall Metal-Insulator Transition

2003-07-30

arxiv.org/abs/cond-mat/0307736v1

Phys. Rev. B 69, 45109 (2004).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, revtex4, 4 eps figures

Scientific paper

10.1103/PhysRevB.69.045109

Scaling properties of the quantum Hall metal-insulator transition are severely affected by finite size effects in small systems. Surprisingly, despite the narrow spatial range where probability structure functions exhibit multifractal scaling, we clearly verify the existence of extended self-similarity -- a hidden infrared scaling phenomenon related to the peculiar form of the crossover at the onset of nonmultifractal behavior. As finite size effects get stronger for structure functions with negative orders, the parabolic approximation for the multifractal spectrum loses accuracy. However, by means of an extended self-similarity analysis, an improved evaluation of the multifractal exponents is attained for negative orders too, rendering them consistent with previous results, which rely on computations performed for considerably larger systems.

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