Orbital-Nematic and Two-Fluid Superconductivity in Hole-Doped NdNiO₂

Based on DFT + DMFT, we investigate the orbital-nematic and s-wave superconducting states of a hole-doped ${\mathrm{NdNiO}}_2$ superconductor. We emphasize the role played by the interorbital proximity effect in determining the orbital-selective electronic state both in the normal and superconducting phases. Specifically, we show how orbital-nematic plus s-wave pairing symmetry acting on the $xz$ orbital might have pronounced effects on proximitized non-superconducting Ni-$3d$ orbitals due to many-particle electron–electron interactions. This work represents a step forward in understanding the emergence of two-fluid superconductivity (with superconducting $xz$ and non-superconducting $xy,yz,x^2-y^2,3z^2-r^2$ channels) in hole-doped ${\mathrm{NdNiO}}_2$ superconductors.