Converting a triplet Cooper pair supercurrent into a spin signal
Sigrid Aunsmo, Jacob Linder
DOI 10.1103/PhysRevB.109.024503 · Physical Review B
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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 has 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 nonlocal 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.
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