Coexistence and tuning of spin-singlet and triplet transport in spin-filter Josephson junctions

Abstract

The increased capabilities of coupling more and more materials through functional interfaces are paving the way to a series of exciting experiments and extremely advanced devices. Here we focus on the capability of magnetically inhomogeneous superconductor/ferromagnet (S/F) interfaces to generate spin-polarized triplet pairs. We build on previous achievements on spin-filter ferromagnetic Josephson junctions (JJs) and find unique correspondence between neat experimental benchmarks in the temperature behavior of the critical current and theoretical modeling based on microscopic calculations, which allow us to determine a posteriori spin-singlet and triplet correlation functions. This kind of combined analysis provides accurate proof of the coexistence and tunability of singlet and triplet transport. This turns to be a unique opportunity to model disorder and spin-mixing effects in a JJ to enlarge the space of parameters, which regulate the phenomenology of the Josephson effect and could be applied to a variety of novel types of JJs.

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• Ferromagnetic Materials for Josephson π Junctions
• Microwave spectroscopy of interacting Andreev spins
• Anomalous Josephson Coupling and High-Harmonics in Non-Centrosymmetric Superconductors with $S$-wave Spin-Triplet Pairing
• Nanoscale spin ordering and spin screening effects in tunnel ferromagnetic Josephson junctions
• Andreev non-Hermitian Hamiltonian for open Josephson junctions from Green's functions
• Tuneable magnetic behaviour, electronic structure and nitrogen vacancy formation in Gd${}_x$Sm${}_{1-x}$N
• Phase dynamics of tunnel Al-based ferromagnetic Josephson junctions
• Spin Splitting Tunable Optical Bandgap in GdN Thin Films for Spin Filtering
• Andreev spin-noise detector
• Spin-split superconductivity in spin-orbit coupled hybrid nanowires with ferromagnetic barriers
• Supercurrent from the imaginary part of the Andreev levels in non-Hermitian Josephson junctions
• Magnetic flux induced higher-order topological superconductivity
• Evidence of the inverse proximity effect in tunnel magnetic Josephson Junctions
• Submicrometer tunnel ferromagnetic Josephson junctions with transmon energy scale
• A hybrid ferromagnetic transmon qubit: circuit design, feasibility and detection protocols for magnetic fluctuations