Chirality and spin transformation of triplet Cooper pairs upon interaction with singlet condensate

Abstract

We show that the fully polarized triplet s-wave component is characterized not only by the spin direction, but also by chirality. Interaction of a polarized triplet component and a singlet one results in creation of triplet Cooper pairs with opposite spin direction or of different chiralities. Such spin transformation leads to interesting phenomena in multiterminal magnetic Josephson junctions. We calculate the dc Josephson current $I_{\text{J}}$ in a multiterminal Josephson contact of the S${}_{\text{m}}$/n/S${}_{\text{m}}^{\prime }$ type with "magnetic" superconductors S${}_{\text{m}}$ that generate fully polarized triplet components. The superconductors S${}_{\text{m}}$ are attached to magnetic insulators (filters) which let to pass electrons with a fixed spin direction only. The filter axes are assumed to be oriented antiparallel to each other. The Josephson current is zero in two-terminal Josephson junction, i.e., in S/n/S${}_{\text{m}}$ or in S${}_{\text{m}}$/n/S${}_{\text{m}}^{\prime }$ contact. But in the three-terminal Josephson junction, with another S superconductor attached to the normal wire, the finite current $I_{\text{J}}$ appears flowing from the S~superconductor to S${}_{\text{m}}$ superconductors. The currents through the right (left) superconductors S${}_{\text{m}}$ are opposite in sign, $I_{\text{R}}\equiv I_{\text{J}}=I_{\text{c}}\sin ({\chi }_{\text{R}}+{\chi }_{\text{L}}-2\chi )=-I_{\text{L}}$, where ${\chi }_{\text{L/R}}$ and $\chi$ are the phases of superconductors S${}_{\text{m}}$, S${}_{\text{m}}^{\prime }$, and S, respectively. We discuss possibilities of experimental observation of the effect.

published version | 8+ pages | 4 figures | text updated

References in corpus (28)

• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
• Superconducting Spintronics
• Anomalous modulation of a zero bias peak in a hybrid nanowire-superconductor device
• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Spin-polarized supercurrents for spintronics: a review of current progress
• Direct coupling between magnetism and superconducting current in Josephson Phi junction
• Evidence for Triplet Superconductivity in a Superconductor-Ferromagnet Spin Valve
• Half-integer Shapiro steps at the 0-pi crossover of a ferromagnetic Josephson junction
• Nonlocal Thermoelectric Effects and Nonlocal Onsager Relations in a Three-Terminal Proximity-Coupled Superconductor-Ferromagnet Device
• Experimental evidence of a ϕ Josephson junction
• Reversible control of spin-polarised supercurrents in ferromagnetic Josephson junctions
• Josephson tunnel junctions with strong ferromagnetic interlayer
• Singularities of Andreev spectrum in multi-terminal Josephson junction
• Triplet proximity effect in superconducting heterostructures with a half-metallic layer
• Quantum limit of the triplet proximity effect in half-metal - superconductor junctions
• Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures
• Proximity effects and triplet correlations in Ferromagnet/Ferromagnet/Superconductor nanostructures
• Magnetic-coupling-dependent spin-triplet supercurrents in helimagnet/ferromagnet Josephson junctions
• Nematic versus ferromagnetic spin filtering of triplet Cooper pairs in superconducting spintronics
• Superconducting Phase Transistor in Diffusive Four-terminal Ferromagnetic Josephson Junctions
• Realization of the $\pi$-state in junctions formed by multi-band superconductors with a spin-density-wave
• Stationary Josephson effect in a short multi-terminal junction
• Nonequilibrium Transport in Superconductor/Ferromagnet/Superconductor Diffusive Junctions: Interplay between Proximity Effect and Ferromagnetism
• Spin Current in Junctions composed of Multi-band Superconductors with a Spin-density Wave

Cited by in corpus (2)

• Spin polarization and orbital effects in superconductor-ferromagnet structures
• Static and dynamic properties of Josephson weak links with singlet and triplet coupling