Weak localization coexisting with a magnetic field in a normal-metal–superconductor microbridge

P. W. Brouwer; C. W. J. Beenakker

doi:10.1103/PhysRevB.52.R3868

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Weak localization coexisting with a magnetic field in a normal-metal–superconductor microbridge

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

DOI 10.1103/PhysRevB.52.R3868 · Physical Review B

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Abstract

A random-matrix theory is presented which shows that breaking time-reversal symmetry by itself does not suppress the weak-localization correction to the conductance of a disordered metal wire attached to a superconductor. Suppression of weak localization requires applying a magnetic field as well as raising the voltage, to break both time-reversal symmetry and electron-hole degeneracy. A magnetic-field-dependent contact resistance obscured this anomaly in previous numerical simulations.