Topological oscillations of the magnetoconductance in disordered GaAs layers

Details Topological oscillations of the magnetoconductance in disordered GaAs layers Topological oscillations of the magnetoconductance in disordered GaAs layers

2003-05-26

arxiv.org/abs/cond-mat/0305601v3

Phys. Rev. Lett. 92, 016802 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.92.016802

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.

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