Spin and Charge Currents in SNS Josephson Junction with f-wave Pairing Symmetry

TL;DR

This paper investigates spin and charge transport in a Josephson junction with f-wave triplet superconductors, revealing unique effects of misorientation and phase difference on currents and local density of states.

Contribution

It provides new insights into how d-vector misalignment influences spin and charge currents, including the emergence of spin currents without charge flow and zero energy peaks.

Findings

Spin current can exist without charge current at certain phase differences.

Misalignment of d-vectors causes zero energy peaks in local density of states.

Unconventional behavior observed at 0-π transition.

Abstract

We study transport properties and also local density of states in a clean superconductor-normal metal-superconductor Josephson junction with triplet f-wave superconductors based on the Eilenberger equation. Effects of thickness of normal metal and misorientation between gap vector of superconductors on the spin and charge currents are investigated. Spin current, which stems from the misalignment of d-vectors, in the absence of charge current for some values of phase difference between superconductors is found. We also find unconventional behavior of the spin current associated with 0-pitransition. The misalignment of d-vectors also gives rise to a zero energy peak in the density of states in the normal metal.