Charge and spin currents in a ballistic SNS Josephson junction between p-wave superconductors

Abstract

Charge and spin transport properties of a clean TS-N-TS Josephson junction (triplet superconductor-normal metal-triplet superconductor) are studied using the quasiclassical Eilenberger equation for Green's function. Effects of thickness of normal layer between superconductors on the spin and charge currents are investigated. The effect of a misorientation between triplet superconductors which creates the spin current is the main subject of this paper. It is shown that for some values of phase difference between superconductors the spin current exists in the absence of charge current and vice versa.

Spin and charge currents in SNS Josephson junction with f-wave pairing symmetry

“…It is clear that by increasing the thickness of the normal layer, the amplitude of the currents decreases, which is understandable because with increasing thickness of the normal metal, the quantum coherence of the macroscopic phases between the left and right superconductors decreases [25]. The current-phase relations are qualitatively different from the case of the s-wave [39] and d-wave Josephson junction [47,41] while they are qualitatively similar to the current-phase relations of the p-wave SNS junction obtained in [25]. In particular, an interesting case is the zero of charge current at finite phase φ 0 in figure 2(b), which occurs for most of the junctions exactly at φ = 0 or π.…”

“…It is well known that in a superconductor-normal metalsuperconductor (SNS) junction a Josephson current flows as a result of the proximity effect [24]. Recently, the proximity effect in unconventional superconductor and normal metal junctions has attracted much attention [25][26][27][28][29][30][31]. The proximity effect in junctions between triplet superconductors and normal metals in the diffusive regime has been investigated theoretically [27][28][29].…”

“…To investigate the proximity effect, the quasiclassical Green's function method is quite useful. The SNS Josephson junction between spin-triplet pwave superconductors in the ballistic regime has been studied recently [25]. The authors found a spin-polarized current dependent on the misorientation and thickness of normal metal sandwiched between the superconductors.…”