Inter-orbital topological superconductivity in spin-orbit coupled superconductors with inversion symmetry breaking

Abstract

We study the superconducting state of multi-orbital spin-orbit coupled systems in the presence of an orbitally driven inversion asymmetry assuming that the inter-orbital attraction is the dominant pairing channel. Although the inversion symmetry is absent, we show that superconducting states that avoid mixing of spin-triplet and spin-singlet configurations are allowed, and remarkably, spin-triplet states that are topologically nontrivial can be stabilized in a large portion of the phase diagram. The orbital-dependent spin-triplet pairing generally leads to topological superconductivity with point nodes that are protected by a nonvanishing winding number. We demonstrate that the disclosed topological phase can exhibit Lifshitz-type transitions upon different driving mechanisms and interactions, e.g., by tuning the strength of the atomic spin-orbit and inversion asymmetry couplings or by varying the doping and the amplitude of order parameter. Such distinctive signatures of the nodal phase manifest through an extraordinary reconstruction of the low-energy excitation spectra both in the bulk and at the edge of the superconductor.

18 pages, 12 figures; Published in Physical Review B

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Cited by in corpus (25)

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• Evolution of topological superconductivity by orbital selective confinement in oxide nanowires
• Evolution of Pair Correlation Symmetries and Supercurrent Reversal in Tilted Weyl Semimetals
• Supercurrent rectification with time-reversal symmetry broken multiband superconductors
• The Triplet Resonating Valence Bond State and Superconductivity in Hund's Metals
• Magnetoelectrically-Tunable Andreev-Bound-State Spectra and Spin Polarization in P-Wave Josephson Junctions
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• Magneto-topological transitions in multicomponent superconductors
• Hallmarks of non-trivial topology in Josephson junctions based on oxide nanochannels
• Orbital tunable 0-$\pi$ transitions in Josephson junctions with noncentrosymmetric topological superconductors
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• Spin-Orbital Hallmarks of Unconventional Superconductors Without Inversion Symmetry
• Interplay between singlet and triplet pairings in multi-band two-dimensional oxide superconductors
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• Strain-induced topological phase transition at (111) SrTiO${}_3$-based heterostructures
• Spin-orbital polarization of Majorana edge states in oxides nanowires
• High orbital-moment Cooper pairs by crystalline symmetry breaking
• Frustration driven Josephson phase dynamics
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• Surface State of Inter-orbital Pairing State in Sr${}_2$RuO${}_4$ Superconductor
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