Figure 1

Schematic view of the Ru $d_{xz}$ and $d_{yz}$ orbitals in the Ru-O plane. The wave-function overlap is larger along the direction of the black arrows than along the direction of the gray arrows, giving us $t\gg t^{\prime }$, and therefore the quasi-1D nature of the bands originating from these orbitals.Reuse & Permissions

Figure 2

The left panel shows as the black solid curves a schematic plot of the Fermi surface originating from the quasi-1D bands that derive primarily from the Ru $d_{xz}$ and $d_{yz}$ orbitals; it was computed from the microscopic model of Sec. 2. (The blue dotted curve represents the Fermi surface of the quasi-2D band arising from the Ru $d_{xy}$ orbitals, which are not included explicitly in the model.) The avoided crossings in the red circled regions reflect the (clearly small) effects of the orbital mixing terms on the Fermi surface structure. The right panel shows the intercomponent Josephson coupling, ${\mathcal{J}}_0$, defined in Eq. (3) as a function of the interorbital coupling energy, $\delta t$, computed by numerically performing the integral in Eqs. (14) and (A7) in Appendix 7a with ${\Delta }_0/t=$ 0.002 (blue), 0.004 (purple), 0.008 (red), and $\eta =0$; the result confirms an approximate linear dependence of ${\mathcal{J}}_0$ on $\left|\delta t\right|{\Delta }_0^2$, as in Eq. (17).Reuse & Permissions