Abstract
We discuss the minimum value of the zero-bias differential conductance in a normal-metal/unconventional-superconductor junction. A numerical simulation demonstrates that the zero-bias conductance is quantized at \((4e^2/h) N_\mathrm {ZES}\) in the limit of strong impurity scatterings in the normal-metal. The integer \(N_\mathrm {ZES}\) represents the number of perfect transmission channels through the junction. By focusing on the chiral symmetry of Hamiltonian, we prove the existence of \(N_\mathrm {ZES}\)-fold degenerate resonant states in the dirty normal segment.
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