Josephson Spin Current in Triplet Superconductor Junctions

TL;DR

This paper theoretically investigates spin currents in triplet superconductor junctions, revealing how midgap states and electromagnetic coupling influence charge and spin transport phenomena.

Contribution

It introduces a theoretical framework for understanding spin currents in triplet superconductor junctions, highlighting the role of midgap states and electromagnetic interactions.

Findings

Midgap Andreev states enhance charge and spin currents at low temperatures.

Magnetic fields produce Frounhofer patterns in spin current.

Bias voltages induce alternating spin currents.

Abstract

This paper theoretically discusses the spin current in spin-triplet superconductor / insulator / spin-triplet superconductor junctions. At low temperatures, a midgap Andreev resonant state anomalously enhances not only the charge current but also the spin current. The coupling between the Cooper pairs and the electromagnetic fields leads to the Frounhofer pattern in the direct current spin flow in magnetic fields and the alternative spin current under applied bias-voltages.