We study the anomalous Josephson effect in a nanowire with Rashba spin-orbit interaction and Zeeman spin splitting, contacted with two s-wave superconducting leads with either one or two open conducting channels in the wire. In both cases, we find that the Josephson current is zero at a value phi(0) not equal 0, pi of the phase difference between the order parameter of the leads. While in the former case the critical current is direction independent, in the latter case we observe an asymmetry between Ic+ (the maximum Josephson current from left to right) and Ic- up to about 20%.
Josephson Current Anomalies in Spin-Orbit Nanowires
Campagnano Gabriele;Lucignano Procolo;Tagliacozzo Arturo
2018
Abstract
We study the anomalous Josephson effect in a nanowire with Rashba spin-orbit interaction and Zeeman spin splitting, contacted with two s-wave superconducting leads with either one or two open conducting channels in the wire. In both cases, we find that the Josephson current is zero at a value phi(0) not equal 0, pi of the phase difference between the order parameter of the leads. While in the former case the critical current is direction independent, in the latter case we observe an asymmetry between Ic+ (the maximum Josephson current from left to right) and Ic- up to about 20%.File in questo prodotto:
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