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Abstract:
Oscillatory variations of the diagonal (G(xx)) and Hall (G(xy))
magnetoconductances are discussed in view of topological scaling
effects giving rise to the quantum Hall effect. They occur in a field
range without oscillations of the density of states due to Landau
quantization, and are, therefore, totally different from the
Shubnikov-de Haas oscillations. Such oscillations are experimentally
observed in disordered GaAs layers in the extreme quantum limit of
applied magnetic field with a good description by the unified scaling
theory of the integer and fractional quantum Hall effect.