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Insensitivity to time-reversal symmetry breaking of universal conductance fluctuations with Andreev reflection

P. W. Brouwer, C. W. J. Beenakker

DOI 10.1103/PhysRevB.52.16772 · Physical Review B

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Abstract

Numerical simulations of conduction through a disordered microbridge between a normal metal and a superconductor have revealed an anomalous insensitivity of the conductance fluctuations to a magnetic field. A theory for the anomaly is presented: both an exact analytical calculation (using random-matrix theory) and a qualitative symmetry argument (involving the exchange of time-reversal for reflection symmetry).

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