Role of Two-Dimensional Ising Superconductivity in the Nonequilibrium Quasiparticle Spin-to-Charge Conversion Efficiency.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34597020.
- Also identified by DOI 10.1021/acsnano.1c07192 and PMC identifier 8552497.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Nonequilibrium studies of two-dimensional (2D) superconductors (SCs) with Ising spin-orbit coupling are prerequisite for their successful application to equilibrium spin-triplet Cooper pairs and, potentially, Majorana Fermions. By taking advantage of the recent discoveries of 2D SCs and their compatibility with any other materials, we fabricate here nonlocal magnon devices to examine how such 2D Ising superconductivity affects the conversion efficiency of magnon spin to quasiparticle charge in superconducting flakes of 2H-NbSe<sub>2</sub> transferred onto ferrimagnetic insulating Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>. Comparison with a reference device based on a conventionally paired superconductor shows that the Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>-induced in-plane (IP) exchange spin-splitting in the NbSe<sub>2</sub> flake is hindered by its inherent out-of-plane (OOP) spin-orbit field, which, in turn, limits the transition-state enhancement of the spin-to-charge conversion efficiency. Our out-of-equilibrium study highlights the significance of symmetry matching between underlying Cooper pairs and exchange-induced spin-splitting for the giant transition-state spin-to-charge conversion and may have implications toward proximity-engineered spin-polarized triplet pairing via tuning the relative strength of IP exchange and OOP spin-orbit fields in ferromagnetic insulator/2D Ising SC bilayers.