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Role of Two-Dimensional Ising Superconductivity in the Nonequilibrium Quasiparticle Spin-to-Charge Conversion Efficiency. | LitMetric

AI Article Synopsis

  • - The study explores how 2D superconductors with Ising spin-orbit coupling can influence the conversion of spin to charge in nonlocal magnon devices, which is essential for understanding their potential use in applications like spin-triplet Cooper pairs and Majorana Fermions.
  • - By comparing a 2D superconductor (2H-NbSe) on a ferrimagnetic insulator (YFeO) to a conventional superconductor, the research found that the YFeO creates an in-plane spin-splitting that conflicts with the out-of-plane spin-orbit field of NbSe, ultimately limiting the conversion efficiency.
  • - This analysis emphasizes the importance of matching symmetries between Cooper pairs and exchange-induced spin-s

Article 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 transferred onto ferrimagnetic insulating YFeO. Comparison with a reference device based on a conventionally paired superconductor shows that the YFeO-induced in-plane (IP) exchange spin-splitting in the NbSe 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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8552497PMC
http://dx.doi.org/10.1021/acsnano.1c07192DOI Listing

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