Theme and goal
Superconducting spin-polarized triplets carry coherent quantum information. Their correlation does not decay in either ferromagnets or superconductors, evenwith impurities. This makes them a primary candidate for low-dissipation information transport in spintronics. We examine the interplay of magnetism and superconductivity in a range of systems using theoretical and numerical techniques. The goal of this research is to show that superconducting triplets are useful, low-dissipation information carriers in emerging spintronic systems.
Until now our research has focused on conversion mechanisms from superconducting singlets to triplets, and their experimentally accessible signatures in standard spintronic contexts using thin-films and nanowires. In the future, we would like to challenge the geometrical constraints required to make use ofsuperconductivity in spintronics.
The first question builds on recent experimental advances in creating spintronic devices with curvature. It is known that curvature affects the spin-orbit coupling that can yield singlet-triplet conversion. Therefore, we will determine the potential and scope of curvature to generate and control triplet populations out of equilibrium. Our second question challenges a more central tenet of superconducting spintronics, which relies on the proximity effect for harnessing superconducting signatures. We will aim to show that triplet signatures can be manipulated non-locally via hybridization with spatially separated magnons in a resonant cavity. This may increase device operational range by several orders of magnitude.
Finally, we aim to apply the advances of superconducting triplet spintronics to other areas of solid-state quantum computing, such as entanglement optimisation and transmission.
For current activities, see QuSpin Annual Report 2019.