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Topological oscillations of the magnetoconductance in disordered GaAs layers
S S Murzin1, A G M Jansen, I Claus
1Institute of Solid State Physics RAS, 142432 Chernogolovka, Moscow District, Russia.
Abstract:
Oscillatory variations of the diagonal (Gxx) 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.
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