Article

New universality of the metal-insulator transition in an integer quantum Hall effect system

A new universality of the metal-insulator transition in an integer quantum Hall effect (IQHE) system is studied, based on a lattice model, where the IQHE states exist only within a finite range of Fermi energy in the presence of disorders. A two-parameter scaling law is found at the high-energy boundary where direct transitions from high filling-factor IQHE states to an insulator occur. We find that ρxx = ρxy at the critical point whose value can continuously vary as a single function of the Landau-level filling number nν. Such a new universality well explains the recent experiment by Song et al. [Phys. Rev. Lett. 78, 2200 (1997)].

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