Degeneracy between even- and odd-parity superconductivity in the quasi-1D Hubbard model and implications for Sr2RuO4

Abstract

Based on a weak coupling calculation, we show that an accidental degeneracy appears between even- and odd-parity superconductivity in the quasi-1D limit of the repulsive Hubbard model on the square lattice. We propose that this effect could be at play on the quasi-1D orbitals Ru $d_{zx}$ and $d_{zy}$ of Sr2RuO4, leading to a gap of the form ${\Delta }_{\text{even}}+i{\Delta }_{\text{odd}}$ which could help reconcile several experimental results.

arXiv comment15 pages, 3 figures, as published in PRB

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Cited by in corpus (6)

• Quantum-geometry-induced anapole superconductivity
• Constraints on the superconducting state of Sr${}_2$RuO${}_4$ from elastocaloric measurements
• Competition between d-wave superconductivity and magnetism in uniaxially strained Sr2RuO4
• Polar Kerr Effect in Multiband Spin-Orbit Coupled Superconductors
• Pairing around a Single Dirac Point: A Unifying View of Kohn-Luttinger Superconductivity in Chern Bands, Quarter Metals, and Topological Surface States
• Influence of Fermi Surface Geometry and Van Hove Singularities on the Optical Response of Sr${}_2$RuO${}_4$