Enhancement of crossed Andreev reflection in a superconducting ladder connected to normal metal leads

Abhiram Soori, Subroto Mukerjee

Published 2016-03-01Version 1

Crossed Andreev reflection (cAR) is a scattering phenomenon that happens in a quantum transport set-up consisting of two normal metals (NM) attached to a superconductor(SC), where an electron incident from one NM results in a hole emerging in the other. Typically, an electron tunneling (ET) through the superconductor from one NM to the other competes with cAR and masks the signature of cAR in the conductance spectrum. We propose a novel way to enhance cAR over ET, so that one can clearly observe the signature of cAR by looking at the conductance spectrum. Our proposal is a variant of the well-studied NM-SC-NM junction where the SC part of the NM-SC-NM is side-coupled to another SC, which has a different SC phase.