Fig. 3: Example of superconducting order parameters found in Fig. 2, calculated from a linearized gap equation in orbital space.

They correspond to U = 1.1 eV and J = 0.22 U. The 3 × 3 matrices represent the spin-orbital states of the paired electrons in the inter-pseudospin channel since the intra-pseudospin terms are vanishing. Each panel shows the momentum structure. We present in a, b the unstrained case with ϵ_xx = 0 and the optimally strained case with \({\epsilon }_{{{{\rm{xx}}}}}^{{{{\rm{vHs}}}}}\) respectively. The SCOP transforms like the one-component B_1g (A_g) irreducible representation of the D_4h (D_2h) group which requires some components to be purely imaginary due to the transformation behavior of the spin-orbitals under rotational symmetries⁶⁸. Since the gap function is only known up to a prefactor, we rescale it from −1 to 1, and the sign and value are encoded in the colorbar. The first Brillouin-zone is marked by the gray square.