Abstract
The problem of σ xx peaks has been studied theoretically in the regime of integer quantum Hall effect (IQHE) for disorder potentials with arbitrary correlation length to magnetic length ratio λ / a H . We obtained analytical solutions for two limiting cases of long-wavelength disorder potential, λ ⪢ r c = n + 1 a H , and short-wavelength disorder potential, λ ⪡ a H . The case of intermediate λ / a H ratio has been studied numerically. Our results are in good agreement with available experimental data but not with the hypothesis of universality due to Khmelnitskii and Pruisken.
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