Josephson anomalous vortices

Abstract

We show that vortices with circulating current, related with odd-frequency triplet pairing, appear in Josephson junctions where the barrier is a weak ferromagnet with strong spin-orbit coupling. By symmetry analysis we show that there is an additional term - a rotary invariant - in the superconducting free energy which allows for magnetoelectric effects even when the previously considered Lifshitz invariant vanishes. Using a microscopic model based on a modified Usadel equation incorporating those effects, we show that the size, shape, and position of these vortices can be controlled by manipulating Rashba spin-orbit coupling in the weak link, via gates, and we suggest that these vortices could be detected via scanning magnetometry techniques. We also show that the transverse triplet components of the pairing amplitudes can form a texture.

8 pages, 4 figures

References in corpus (24)

• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Odd Triplet Superconductivity and Related Phenomena in Superconductor-Ferromagnet Structures
• Scanning nano-SQUID with single electron spin sensitivity
• Strong Rashba-Edelstein Effect-Induced Spin-Orbit Torques in Monolayer Transition-Metal Dichalcogenide/Ferromagnet Bilayers
• Spin-orbit coupling as a source of long-range triplet proximity effect in superconductor-ferromagnet hybrid structures
• Theory of 2D superconductor with broken inversion symmetry
• Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures
• Currents induced by magnetic impurities in superconductors with spin-orbit coupling
• Anomalous current in diffusive ferromagnetic Josephson junctions
• Spontaneous currents in superconducting systems with strong spin-orbit coupling
• Onsager relations in a two-dimensional electron gas with spin-orbit coupling
• Supercurrent Diode Effect in Helical Superconductors
• Scanning nitrogen-vacancy center magnetometry in large in-plane magnetic fields
• Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors
• Nonlinear $\sigma$-model for disordered systems with intrinsic spin-orbit coupling
• Theory of magnetic response in finite two-dimensional superconductors
• Supercurrent Vortex Pinball via a Triplet Cooper Pair Inverse Edelstein Effect
• Non-linear sigma model with particle-hole asymmetry for the disordered two-dimensional electron gas
• Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope
• Magneto-anisotropic weak antilocalization in near-surface quantum wells
• Magnetoelectric effects in diffusive two-dimensional superconductors studied by the nonlinear $\sigma$ model
• Competition of vortex core structures in superfluid ${}^3$He-B
• Transitions in vortex skyrmion structures in superfluid ${}^3$He-A driven by an analogue of the zero-charge effect
• Structure of a single-quantum vortex in ${}^3$He-A