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

M. A. Silaev

doi:10.1103/PhysRevB.77.014504

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

M. A. Silaev

DOI 10.1103/PhysRevB.77.014504 · Physical Review B

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Abstract

We investigate the low-energy quantum transport in ballistic normal metal-insulator-superconductor junction exposed to a magnetic field, creating Abrikosov vortices in the superconducting region. Within the Bogolubov–de Gennes theory, we show that the presence of the subgap quasiparticle states localized within the vortex cores near the junction interface leads to the strong resonant enhancement of Andreev reflection probability, and the normal-to-supercurrent conversion. The corresponding increase of charge conductance is determined by the distance from the vortex chain to the junction interface, which can be controlled by the applied magnetic field.