Stabilizing Even-Parity Chiral Superconductivity in Sr₂RuO₄

The singlet-like response observed in spin-susceptibility measurements has reopened the question of the pairing state of Sr₂RuO₄. Together with the evidence for broken time-reversal symmetry and a jump in the shear modulus c₆₆ at the superconducting transition temperature, the available experiments point towards an even-parity chiral superconductor with k_z(k_x±ik_y)-like E_g symmetry, which has consistently been dismissed based on the quasi-two-dimensional electronic structure of Sr₂RuO₄. In this talk, I will discuss how the orbital degree of freedom can encode the two-component nature of the E_g order parameter, allowing for an s-wave orbital-antisymmetric spin-triplet E_g state that can be stabilized by on-site Hund's coupling. Also, I will discuss nodal Bogoliubov Fermi surfaces in this state.