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-NbSe2 transferred onto ferrimagnetic insulating Y3Fe5O12. Comparison with a reference device based on a conventionally paired superconductor shows that the Y3Fe5O12-induced in-plane (IP) exchange spin-splitting in the NbSe2 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.
Highlights
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
How out-of-plane (OOP) Cooper pairing of the 2H-NbSe2 affects the transition-state enhancement of QP inverse spin-Hall effect (iSHE) will be discussed in this study. (b) Crystal structure of the 2H-NbSe2, where in-plane inversion symmetry breaking by Se plus spin−orbit coupling of Nb lead to OOP spin-singlet (S = 0) Cooper pairs, constituting Ising superconductivity. (c,e,g,i) Optical micrographs of the fabricated devices
Our nonlocal magnon spin-transport devices (Figure 1a) are composed of two identical Pt electrodes and a central 2-H NbSe2 flake transferred onto 200 nm thick single-crystalline
Summary
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-NbSe2 transferred onto ferrimagnetic insulating Y3Fe5O12. Comparison with a reference device based on a conventionally paired superconductor shows that the Y3Fe5O12-induced in-plane (IP) exchange spin-splitting in the NbSe2 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. Cooper pairs and exchange-induced spin-splitting for the giant transition-state spin-tocharge 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. Atomic force microscopy (AFM) scans of the transferred 2H-NbSe2 flakes (d,f,h) and the deposited Nb thin film (j)
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