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We study the differential conductance of a time-reversal symmetric Weylsemimetal-superconductor (N-S) junction with an s-wave superconducting state.We find that there exists an extended regime where the zero-bias differentialconductance acquires the universal value $e^{2}/h$ per unit channel,independent of the pairing and chemical potentials on each side of thejunction, due to a perfect cancellation of Andreev and normal reflectioncontributions. This universal conductance can be attributed to the interplay ofthe unique spin/orbital-momentum locking and s-wave pairing that couples Weylnodes of the same chirality. We expect that the universal conductance can serveas a robust and distinct signature for time-reversal symmetric Weyl fermions,and be observed in the recently discovered time-reversal symmetric Weylsemimetals.

Appearance of the universal value $e^{2}/h$ of the zero-bias conductance in a Weyl semimetal-superconductor junction