Spin-Orbital Hallmarks of Unconventional Superconductors Without Inversion Symmetry
arXiv:1903.12379 · doi:10.1103/PhysRevB.100.104524
Abstract
The spin-orbital polarization of superconducting excitations in momentum space is shown to provide distinctive marks of unconventional pairing in the presence of inversion symmetry breaking.Taking the prototypical example of an electronic system with atomic spin-orbit and orbital-Rashba couplings, we provide a general description of the spin-orbital textures and their most striking changeover moving from the normal to the superconducting state. We find that the variation of the spin-texture is strongly imprinted by the combination of the misalignment of spin-triplet d-vector with the inversion asymmetry g-vector coupling and the occurrence of superconducting nodal excitations. Remarkably, the multi-orbital character of the superconducting state allows to unveil a unique type of topological transition for the spin-winding around the nodal points. This finding indicates the fundamental topological relation between chiral and spin-winding in nodal superconductors. By analogy between spin- and orbital-triplet pairing we point out how orbital polarization patterns can be also employed to assess the character of the superconducting state.
6+10 pages, 4+2 figures
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- Anomalous Josephson Coupling and High-Harmonics in Non-Centrosymmetric Superconductors with -wave Spin-Triplet Pairing
- Spin-orbital polarization of Majorana edge states in oxides nanowires
- High orbital-moment Cooper pairs by crystalline symmetry breaking
- Ballistic transport through quantum point contacts of multi-orbital oxides
- Proximity effect in a superconductor-topological insulator heterostructure based on first principles
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- Detecting the topological winding of superconducting nodes via Local Density of States
- Particle-hole spectral asymmetry at the edge of multiorbital noncentrosymmetric superconductors