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We investigate the low-energy quantum transport in the ballistic normalmetal-insulator -superconductor junction in the presence of magnetic fieldcreating Abrikosov vortices in the superconductor. Within the Bogolubov- deGennes theory we show that the presence of the subgap quasiparticle stateslocalized within the vortex cores near the junction interface leads to thestrong resonant enhancement of the Andreev reflection probability, and thenormal-to supercurrent conversion. The corresponding increase of the chargeconductance of the junction is determined by the distance from the vortex chainto the junction interface, which can be controlled by the applied magneticfield. The effect that we study provides a tool for probing the vortex corestates by the measurements of charge transport across the applied magneticfield.

Conductance enhancement due to the resonant tunneling into the subgap vortex core states in normal metal/superconductor ballistic junctions