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.

15 pages, 3 figures, as published in PRB

References in corpus (20)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Enhancement of superconductivity near a nematic quantum critical point
• Chiral P-Wave Order in Sr_2RuO_4
• Observation of half-height magnetization steps in Sr2RuO4
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• Strong spin-orbit coupling effects on the Fermi surface of Sr2RuO4 and Sr2RhO4
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• Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr${}_2$RuO${}_4$ under uniaxial stress
• Thermodynamic Evidence for a Two-Component Superconducting Order Parameter in Sr${}_2$RuO${}_4$
• Is Sr2RuO4 a Chiral P-Wave Superconductor?
• Ultrasound evidence for a two-component superconducting order parameter in Sr${}_2$RuO${}_4$
• A proposal for reconciling diverse experiments on the superconducting state in Sr2RuO4
• Momentum Resolved Superconducting Energy Gaps of Sr${}_2$RuO${}_4$ from Quasiparticle Interference Imaging
• Evidence for even parity unconventional superconductivity in Sr${}_2$RuO${}_4$
• Vanishing edge currents in non-$p$-wave topological chiral superconductors
• Non-topological nature of the edge current in a chiral p-wave superconductor
• Suppression of spontaneous currents in Sr${}_2$RuO${}_4$ by surface disorder
• Spin Density Wave Fluctuations and p-wave Pairing in Sr2RuO4
• Spin-orbit coupling and spin-triplet pairing symmetry in $\mathrm{S}{\mathrm{r}}_2\mathrm{Ru}{\mathrm{O}}_4$
• Third Order Perturbation Analysis of Pairing Symmetry in Two-Dimensional Hubbard Model

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${}_4$