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A ballistic strip of graphene (width W>> length L) connecting two normalmetal contacts is known to have a minimum conductivity of 4e^{2}/pi h at theDirac point of charge neutrality. We calculate what happens if one of the twocontacts becomes superconducting. While the ballistic conductance away from theDirac point is increased by Andreev reflection at the normal-superconductor(NS) interface, we find that the minimum conductivity stays the same. This isexplained as a manifestation of pseudo-diffusive conduction at the Dirac point.As a generalization of our results for a ballistic system, we provide arelation between the conductance G_NS of an arbitrarily disorderednormal-superconductor junction in graphene and its value G_N when both contactsare in the normal state.Comment: 4 pages, 3 figure

Pseudodiffusive conduction at the Dirac point of a normal-superconductor junction in graphene