Conductance fluctuations of semiconductor-superconductor microjunctions in the quantum Hall regime

Y. Takagaki; K. H. Ploog

doi:10.1103/PhysRevB.58.7162

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Conductance fluctuations of semiconductor-superconductor microjunctions in the quantum Hall regime

Y. Takagaki, K. H. Ploog

DOI 10.1103/PhysRevB.58.7162 · Physical Review B

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Abstract

We numerically study the high-magnetic-field conductance of two-dimensional electron-gas–superconductor junctions in the presence of a short-range disorder. The disorder-induced multiple Andreev reflection leads to a dip in the conductance at the depopulation thresholds of the Landau levels. The dip evolves into rapid fluctuations when increasing the magnetic field. In such a high-field regime, the correlation magnetic field of the conductance fluctuations changes enormously depending on the location of the Fermi level relative to the Landau levels. Correspondingly, the amplitude of the conductance fluctuations varies significantly as the Fermi level sweeps through the Landau levels.