P-wave pairing near a spin-split Josephson junction
arXiv:2403.12889 · doi:10.1007/s10909-024-03176-0
Abstract
Superconductivity and magnetism are competing effects that can coexist in certain regimes. Their co-existence leads to unexpected new behaviors that include the onset of exotic electron pair mechanisms and topological phases. In this work, we study the properties of a Josephson junction between two spin-split superconductors. The spin-splitting in the superconductors can arise from either the coupling to a ferromagnetic material or an external magnetic field. The properties of the junction are dominated by the Andreev bound states that are also split. One of these states can cross the superconductor's Fermi level, leading to a ground state transition characterized by a suppressed supercurrent. We interpret the supercurrent blockade as coming from a dominance of p-wave pairing close to the junction, where electrons at both sides of the junction pair. To support this interpretation, we analyze the different pairing channels and show that p-wave pairing is favored in the case where the magnetization of the two superconductors is parallel and suppressed in the anti-parallel case. We also analyze the noise spectrum that shows signatures of the ground state transition in the form of an elevated zero-frequency noise.
arXiv comment6 figures, 16 pages. Article submitted to an Special Issue in honor of Alexander Andreev
References in corpus (27)
- Superconducting Spintronics
- Spin-polarized supercurrents for spintronics: a review of current progress
- Symmetry and Topology in Superconductors - Odd-frequency pairing and edge states -
- Hamiltonian approach to the transport properties of superconducting quantum point contacts
- Triplet supercurrents in clean and disordered half-metallic ferromagnets
- Theory of Half Metal-Superconductor Heterostructures
- Topological Superconductivity in a Planar Josephson Junction
- Two-dimensional platform for networks of Majorana bound states
- Odd-frequency superconductivity
- Colloquium: Nonequilibrium effects in superconductors with a spin-splitting field
- Zero-field Topological Superconductivity in Ferromagnetic Hybrid Nanowires
- Andreev Bound States and Their Signatures
- Quasiclassical description of transport through superconducting contacts
- Enhanced proximity effect in zigzag-shaped Majorana Josephson junctions
- The Majorana STM as a perfect detector of odd-frequency superconductivity
- Nonsinusoidal current-phase relations in semiconductor-superconductor-ferromagnetic insulator devices
- Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic insulator islands
- Supercurrent reversal in ferromagnetic hybrid nanowire Josephson junctions
- Influence of the impurity scattering on charge transport in unconventional superconductor junctions
- Odd-frequency superconductivity near a magnetic impurity in a conventional superconductor
- Current fluctuations in unconventional superconductor junctions with impurity scattering
- Anomalous Proximity Effect of Planer Topological Josephson Junctions
- Spin-polarized multiple Andreev reflections in spin-split superconductors
- Topological superconductivity in a magnetic-texture coupled Josephson junction
- Signatures of odd-frequency pairing in the Josephson junction current noise
- Phase-tunable multiple Andreev reflections in a quantum spin Hall strip
- Supercurrent reversal in Zeeman-split Josephson junctions