Converting a triplet Cooper pair supercurrent into a spin-signal

TL;DR

This paper predicts that supercurrents carried solely by triplet Cooper pairs can induce a measurable non-local magnetization, enabling dissipationless spin information transfer in superconducting systems.

Contribution

It introduces a novel experimental signature of triplet Cooper pair supercurrents through induced spin signals, facilitating direct measurement of their spin polarization.

Findings

Triplet supercurrents induce non-local magnetization.

Spin polarization controls the magnetization direction.

Provides a protocol for dissipationless spin transfer.

Abstract

Superconductivity with spin-polarized Cooper pairs is known to emerge by combining conventional spinless superconductors with materials that have spin-dependent interactions, such as magnetism and spin-orbit coupling. This enables a dissipationless and conserved flow of spin. However, actually utilizing the spin-polarization of such supercurrents have proven challenging. Here, we predict an experimental signature of current-carrying triplet Cooper pairs in the form of an induced spin-signal. We show that a supercurrent carried only by triplet Cooper pairs induces a non-local magnetization that is controlled by the polarization direction of the triplet Cooper pairs. This provides a measurement protocol to directly use the spin-polarization of the triplet Cooper pairs in supercurrents to transfer spin information in a dissipationless manner.